d. 7.60 6=6.18 %3D e. 9.20 21. In 1965, the mean price of a new car was $2,650 and the standard deviation was $100 mean was $30,500 and the standard deviation was $9000. If a Ford Mustang cost $2 and $28,000 in 2011, in which year was it more expensive relative to other cars? 1965, because the standard score is higher than in 2011,300-2650 1965, because the percentile is higher than in 2011. 2011, because the standard score is higher than in 1965. d. 2011, because the percentile is higher than in 1965. We cannot compare the two prices, because we don't know if the prices for each year are Normally distributed. 1965 a. b. 1000 с. -:35 e.

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с. 95
d.
360x 2370
380x0.03=95
190
e.
None of these
C 20. The mean age (at inauguration) of all U.S. Presidents is approximately Normally distributed with a
mean of 54.6. Barack Obama was 47 when he was inaugurated, which is the 11th percentile of the
distribution. Which of the following is closest to the standard deviation of presidents' ages?hvNorm (Ol
留2化
a.
-9.20
M= 54.6
Z= 47-54.6
Z=-1,23
b.
-6.18
= -1:23
%3D
с.
6.18
d. 7.60
9.20
6=6.18
e.
%3D
a 21. In 1965, the mean price of a new car wąs $2,650 and the standard deviation was $1000, In 2011, the
mean was $30,500 and the standard deviation was $9000. If a Ford Mustang cost $2300 in 1965
and $28,000 in 2011, in which year was it more expensive relative to other cars?
1965, because the standard score is higher than in 2011, 300-2650
1965, because the percentile is higher than in 2011.
2011, because the standard score is higher than in 1965.
d. 2011, because the percentile is higher than in 1965.
We cannot compare the two prices, because we don't know if the prices for each
year are Normally distributed.
a.
1965
b.
28,000-30J00
1000
с.
9000
-.35
-,28
e.
22. The customer service department of an online store keeps track of the length of time customers wait
on hold for a representative. The mean wait time is 5 minutes and the standard deviation is 2.3
minutes. Suppose the company wants to change the variable from minutes to seconds exceeding a
target time of 120 seconds. That is, if X is wait time in minutes, the new variable is Y= 60X – 120.
Which of the following are the mean and standard deviation of Y?
Hy = 180; ơ,=2.3
b. Hy = 180; oy=18
Hy = 180; 0,=138
%3D
a.
M=Smin
300 -120 =18o
lred)
6 =2.3
> 138
133
с.
%3D
Transcribed Image Text:с. 95 d. 360x 2370 380x0.03=95 190 e. None of these C 20. The mean age (at inauguration) of all U.S. Presidents is approximately Normally distributed with a mean of 54.6. Barack Obama was 47 when he was inaugurated, which is the 11th percentile of the distribution. Which of the following is closest to the standard deviation of presidents' ages?hvNorm (Ol 留2化 a. -9.20 M= 54.6 Z= 47-54.6 Z=-1,23 b. -6.18 = -1:23 %3D с. 6.18 d. 7.60 9.20 6=6.18 e. %3D a 21. In 1965, the mean price of a new car wąs $2,650 and the standard deviation was $1000, In 2011, the mean was $30,500 and the standard deviation was $9000. If a Ford Mustang cost $2300 in 1965 and $28,000 in 2011, in which year was it more expensive relative to other cars? 1965, because the standard score is higher than in 2011, 300-2650 1965, because the percentile is higher than in 2011. 2011, because the standard score is higher than in 1965. d. 2011, because the percentile is higher than in 1965. We cannot compare the two prices, because we don't know if the prices for each year are Normally distributed. a. 1965 b. 28,000-30J00 1000 с. 9000 -.35 -,28 e. 22. The customer service department of an online store keeps track of the length of time customers wait on hold for a representative. The mean wait time is 5 minutes and the standard deviation is 2.3 minutes. Suppose the company wants to change the variable from minutes to seconds exceeding a target time of 120 seconds. That is, if X is wait time in minutes, the new variable is Y= 60X – 120. Which of the following are the mean and standard deviation of Y? Hy = 180; ơ,=2.3 b. Hy = 180; oy=18 Hy = 180; 0,=138 %3D a. M=Smin 300 -120 =18o lred) 6 =2.3 > 138 133 с. %3D
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