Answer:
C. 61/pi/18
Step-by-step explanation:
I calculated logically
A stock market analyst notices that in a certain year, the price of IBM stock increased on 131 out of 252 trading days. Can these data be used to find a 95% confidence interval for the proportion of days that IBM stock increases
Answer:
95% confidence interval for the proportion of days that IBM stock increases.
(0.45814 , 0.58146)
Step-by-step explanation:
Step:1
Given that a stock market analyst notices that in a certain year, the price of IBM stock increased on 131 out of 252 trading days.
Given that the sample proportion
[tex]p^{-} = \frac{131}{252} = 0.5198[/tex]
Level of significance = 0.05
Z₀.₀₅ = 1.96
Step:2
95% confidence interval for the proportion of days that IBM stock increases.
[tex](p^{-} - Z_{0.05} \frac{\sqrt{p(1-p)} }{\sqrt{n} } , p^{-} + Z_{0.05} \frac{\sqrt{p(1-p)} }{\sqrt{n} } )[/tex]
[tex](0.5198 - 1.96(\sqrt{\frac{0.5198(1-0.5198)}{252} } , 0.5198 +1.96(\sqrt{\frac{0.5198(1-0.5198)}{252} })[/tex]
(0.5198 - 0.06166 , 0.5198+0.06166)
(0.45814 , 0.58146)
Final answer:-
95% confidence interval for the proportion of days that IBM stock increases.
(0.45814 , 0.58146)
sonya got 8 out of 10 questions right on a quiz.she got the same score on a quiz that had 20 questions. how many questions did sonya get right on the second quiz? how many questions did she get wrong on the second quiz?
MUST SHOW WORK
Answer:
Sonya got 16 questions correct.
Step-by-step explanation:
8/10=80%
80%×20=16
(To check)
16/20=80%
Question 6 of 15
Which of the following is a polynomial?
Answer:
A
Step-by-step explanation:
Solve for n. (7^2)^4 = n^8
The angle of depression from a person on top of a cliff to a point 34 feet from the base of the cliff is 30°. what is the height of the cliff?
Nine years ago, Tarah opened a savings account with her bank. She started with a balance of $359 and has not made any withdrawals or deposits since then. If her interest rate is 8% each year, how much interest has accrued using simple interest?
What is Tarah's new total balance?
Answer:
$258.48
Step-by-step explanation:
Random samples of female and male UVA undergraduates are asked to estimate the number of alcoholic drinks that each consumes on a typical weekend. The data is below:
Females (Population 1): 2, 2, 2, 5, 5, 5, 1, 2, 3, 5
Males (Population 2): 5, 4, 5, 7, 4, 7, 5, 4, 4, 8
Give a 97.6% confidence interval for the difference between mean female and male drink consumption. (Assume that the population variances are equal.)
Confidence Interval =
Answer:
Confidence Interval =-3.4085 ,+0.7915
Step-by-step explanation:
The confidence interval can be determined by
(x1`- x2`) ± 1.955 √s1²/n1 + s2²/n2
The mean and the standard deviations can be calculated using the calculator.
The mean x1`= ∑x/ n= 2+ 2+ 2+ 5+ 5+ 5+ 1+2+ 3+ 5/10
= 32/10= 3.2
Standard deviation = s1`= 1.536
The mean x2`= ∑x/ n= 5 +4 +5+ 7+ 4+ 7+ 5+ 4+ 4+ 8/10
= 53/10= 5.3
Standard Deviation = s2= 1.4177=1.42
Putting the values
(x1`- x2`) ± 1.955 √s1²/n1 + s2²/n2
(3.2-5.3 ) ± 1.955 √1.54²/10 +1.42²/10
-2.1 ± 1.955 √ 2.37/10 +2.11/10
-2.1 ± 1.3085
-3.4085 ,+0.7915
PLSS HELP
A paper store spent 1/4 of all the money they earned in December to buy new inventory. It used 1/2 of the rest of the money to pay bills. Then, they still had $3,000 left over. How much money did the store earn in December?
Answer:
$8,000
Step-by-step explanation:
Let the store earned $x in December.
Therefore,
Money spent to buy new inventory [tex] =\frac{1}{4} x[/tex]
Remaining money [tex] = x - \frac{1}{4} x =\frac{3}{4} x[/tex]
Money used to pay bills [tex] =\frac{1}{2} \times \frac{3}{4} x=\frac{3}{8} x[/tex]
Money still left over = $3,000
Total money earned in December [tex]= \frac{1}{4} x+ \frac{3}{8} x+3,000[/tex]
[tex]\therefore x= \frac{1}{4} x+ \frac{3}{8} x+3,000[/tex]
[tex]\therefore x= \frac{2}{8} x+ \frac{3}{8} x+3,000[/tex]
[tex]\therefore x= \frac{5}{8} x+ 3,000[/tex]
[tex]\therefore x- \frac{5}{8} x=3,000[/tex]
[tex]\therefore \frac{8x-5x}{8} =3,000[/tex]
[tex]\therefore \frac{3x}{8} =3,000[/tex]
[tex]\therefore x =3,000\times \frac {8}{3}[/tex]
[tex]\therefore x =1,000\times 8[/tex]
[tex]\therefore x =\$8,000[/tex]
Thus, total money earned in December is $8,000.
Find a consecutive odd numbers where the sum of the first three numbers is 15 greater then the final two numbers.
Answer:
15, 17, 19
Step-by-step explanation:
x + x+2 + x+4 = 15 + (x+2 + x+4)
3x + 6 = 15 + 2x + 21
x = 15
x+2 = 17
x+4 = 19
Find the area of this trapezoid.
A. 240 cm2
B. 288 cm2
C. 312 cm2
D. 336 cm2
Answer:
b. 288cm^2
Step-by-step explanation:
[tex]a = \frac{a + b}{2} h[/tex]
[tex] \frac{15 + 21}{2} (16)[/tex]
[tex]a = 288[/tex]
11
Solve for A, B, and C:
3
a
<
26°
b
C
Answer:
A = 154°
B = 26°
C = 154°
Step-by-step explanation:
✔️A = 180° - 26° (angels on a straight line)
A = 154°
✔️<B and 26° are vertical angles. Therefore,
B = 26° (based in the vertical angles theorem, vertical angles are congruent to each other)
✔️C = A (based in the vertical angles theorem, vertical angles are congruent to each other)
Substitute
C = 154°
Brie saves her $5 weekly allowance for several weeks and uses the money to buy a game for $32. She has $8 remaining. For how many weeks did Brie save her allowance
Answer:
8 weeks
Step-by-step explanation:
hope this helps!!
One professional basketball player typically attempts eight free throws per game. Let X represent the number of free throws made out of eight. The distribution for X is shown in the table.
Which of the following is the correct interpretation of P(X ≤ 3)?
The probability of the number of free throws made out of 8 is at most 3.
The probability of the number of free throws made out of 8 is at least 3.
The probability of the number of free throws made out of 8 is lower than 3.
The probability of the number of free throws made out of 8 is higher than 3.
Answer: its a
Step-by-step explanation:
just answered on edge :)
f(x)=3x 2 +6x−18Find f(10)
Answer:
342
Step-by-step explanation:
To find f(10), simply substitute x for 10, resulting in 300+60-18 = 342
What is the value,in degree, of y
Answer:
y = 122º
Step-by-step explanation:
x + z = 116
x = z
2x = 116
x = 58
x + y = 180
58 + y = 180
y = 180 - 58
y = 122º
Which function has a range of y < 3?
Answer:
C. y=-(2)^x + 3
a loaf of bread has 12 slice. micky ate 1/4 of the loaf. write the fraction of the loaf micky ate in twelfths
Answer:
3/12
Step-by-step explanation:
1/4*3/3=3/12
Khan Question :) will make brainliest <3
Answer:
150[tex]\pi[/tex]
Step-by-step explanation:
Use the formula [tex]\pi[/tex]r^2h
The radius is 5 and the height is 6
so [tex]\pi[/tex](5)^2(6)
=150[tex]\pi[/tex]
ILL GIVE BRAINLYEST TO WHOEVER IS CORRECT PLEASE
The dot plots show the amounts, in dollars, that two
waiters made in tips at different tables.
Waiter A: Tips (dollars)
4 6 8 10 12 14 16 18 20 22 24
Waiter B: Tips (dollars)
4 6 8 10 12 14 16 18 20 22 24
Which of the following statements is correct?
A. The mean for waiter B is higher than the mean for waiter A.
B. The mean for waiter A is the same as the mean for waiter B.
C. The mean for waiter A is higher than the mean for waiter B.
O D. There are more tips shown for waiter A than for waiter B in the dot
plots.
Answer:
A The mean for waiter B is higher than the mean for waiter A.
Answer:
The mean for waiter B is higher than the mean for waiter A.
Step-by-step explanation:
Test approved
quadrilateral RUST has a vertex at R (1,5)
what are the coordinates of R after translation (x,y) ---> (x+1,y-2), followed by a dilation by a scale factor of 3, centered at the origin?
A.(6,2)
B(5,8)
C(6,6)
D.(6,9)
Answer:
D
Step-by-step explanation
translation
x1 = x+1 = 2
y1 = y-2 = 3
(2;3)
dilation
x1 = 3x = 6
y2 = 3y = 9
(6,9)
The mean for a data set is 60. The Z-score for
data point a is 0. The z-score for data point b
is -0.4. Which are the possible values for data
point a and b?
A. a = 0 and b = 61.2
B. a = 0 and b = 58.8
C. a = 60 and b = 61.2
D. a = 60 and b = 58.8
Answer:
D. a = 60 and b = 58.8
Step-by-step explanation:
Z-score:
In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the z-score of a measure X is given by:
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.
Z-score for data point a is 0.
This means that a is the mean, that is, a = 60.
The z-score for data point b is -0.4.
This means that b must be a value below the mean, that is, a value below 60.
The option that satisfies a = 60 and b < 60 is option D, which is the answer.
Can Someone Please Help Asap!!
Answer:
y = 54
x = 36
Step-by-step explanation:
Using tan x or y = opp/adj
Which expression means "10 less than the sum of a and b"?
Answer:
B
Step-by-step explanation:
pretty much just gave you the anwsers
The expression means "10 less than the sum of a and b" is 10 - (a + b). Then the correct option is C.
What is subtraction?It simply implies subtracting something from an entity, group, location, etc. Subtracting from a collection or a list of ways is known as subtraction.
The sum of a and b is given as
→ a + b
Then the meaning of the less than is minus.
That means 10 minus a + b
This can be written as
→ 10 - (a + b)
Thus, the correct option is C.
More about the subtraction link is given below.
https://brainly.com/question/4319655
#SPJ2
Need help pls. 100 points
arcAE = 126°
Step-by-step explanation:
Note that arcAD is a diameter therefore arcAD = 180°. And arcAD = arcAE + arcED
Also note that the inscribed angleEAD intercepts the arcED and according to the inscribed angle theorem,
angleEAD = (1/2)arcED
or
arcED = 2×angleEAD = 2×(27°) = 54°
This means that the arcAE is
arcAE = arcAD - arcED
= 180° - 54°
= 126°
[tex]\\ \sf\longmapsto arc \overset{\sim}{ED}=2(<A)=2(27)=54°[/tex]
Now
[tex]\\ \sf\longmapsto arc\overset{\sim}{AE}+arc\overset{\sim}{ED}=180[/tex]
[tex]\\ \sf\longmapsto arcc\overset{\sim}{AE}=180-54=126°[/tex]
Keisha, Boris, and Jose sent a total of 126 text messages over their cell phones during the weekend. Boris sent 4 times as many messages as Jose. Jose sent 6 fewer messages than Keisha. How many messages did they each send?
Answer:
Boris=504 keisha=120
Step-by-step explanation:
First you would start off by Multiplying 4x126 the result of that is= 504 so thats how much Boris sent. To get the answer to how many jose sent you simply just subtract 6-126 and that should result in 120
Select the correct answer. What is the solution of this system of equations? y = 3x + 5 y = -x + 3
find the area of each trapezoid or kite
9514 1404 393
Answer:
8) 42 in²
9) 33 cm²
10) 112 yd²
Step-by-step explanation:
8) The area is given by the formula ...
A = 1/2(b1 +b2)h
A = (1/2)(9 in +5 in)(6 in) = 42 in²
__
9) The area is half the product of the lengths of the diagonals.*
A = 1/2(d1)(d2)
A = 1/2(6 cm)(11 cm) = 33 cm²
__
10) As in the previous problem, ...
A = 1/2(14 yd)(16 yd) = 112 yd²
_____
* This formula works for any quadrilateral with perpendicular diagonals.
Please help me with my homework and thank you
Answer:
14.4 m
Step-by-step explanation:
From the question given above, the following data were obtained:
Hypothenus = 36 m
Height of building (H) = 33 m
Length of shadow (L) =?
The length of the shadow can be obtained as follow:
Hypothenus² = H² + L²
36² = 33² + L²
1296 = 1089 + L²
Collect like terms
1296 – 1089 = L²
207 = L²
Take the square root of both side
L = √207
L = 14.4 m
Therefore, the length of the shadow is 14.4 m
Cooper invested $3,100 in an account paying an interest rate of 2%
compounded quarterly. Robert invested $3,100 in an account paying an
interest rate of 3 % compounded continuously.After 12 years, how much
more money would Robert have in his account than Cooper, to the nearest
dollar?
Answer:
Rounded to the nearest dollar, Robert will have $ 505 more than Cooper on his account.
Step-by-step explanation:
Given that Cooper invested $ 3,100 in an account paying an interest rate of 2% compounded quarterly, while Robert invested $ 3,100 in an account paying an interest rate of 3% compounded continuously, to determine, after 12 years, how much more money would Robert have in his account than Cooper to the nearest dollar, the following calculation must be made:
Compound interest formula: Initial x (1 + interest / composition) ^ composition x years
Continuous compound interest formula: Initial x exp ^ (interest x years)
Cooper:
3,100 x (1 + 0.02 / 4) ^ 12x4 = X
3,100 x (1 + 0.005) ^ 48 = X
3,100 x 1,005 ^ 48 = X
3,100 x 1,270 = X
3,938.51 = X
Robert:
3,100 x 2.71828182845904 ^ (3x12) = X
4,443.32 = X
4,443.32 - 3,938.51 = X
504.51 = X
Therefore, rounded to the nearest dollar, Robert will have $ 505 more than Cooper on his account.
Answer:
$139
Step-by-step explanation:
A pair of roller skates is discounted by 40%. The normal price is $65. What is the discounted price?
Answer:$39
Step-by-step explanation:
The discounted price is going to be 60% of the original price because 100 - 40 = 60. So we want to find 60% of the original price, or 65. 65 x . 6 = 39, so the pair of rollerskates will be $39 at the discounted price.
