C18. Mr. Yates picked up a dozen items in the grocery store with a mean cost of $3.25. Then he added an apple pie for $6.50. The new mean for all 13 items is $3.00 $3.50 a. b. C $3.75 d. $4.88 e. None of the above

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C 18. Mr. Yates picked up a dozen items in the grocery store with a mean cost of $3.25. Then he added ar
apple pie for $6.50. The new mean for all 13 items is
$3.00
a.
b.
$3.50
C $3.75
d.
$4.88
e.
None of the above
19. The five-number summary for scores on a statistics exam is 11, 35, 61, 70, 79. In all, 380 students
took the test. About how many had scores between 35 and 61?
a. 26
b.
76
с.
95
d.
190
e.
None of these
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?
a.
-9.20
b.
-6.18
6.18
с.
d. 7.60
e.
9.20
21. In 1965, the mean price of a new car was $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.
a.
in 2011
Transcribed Image Text:12 C 18. Mr. Yates picked up a dozen items in the grocery store with a mean cost of $3.25. Then he added ar apple pie for $6.50. The new mean for all 13 items is $3.00 a. b. $3.50 C $3.75 d. $4.88 e. None of the above 19. The five-number summary for scores on a statistics exam is 11, 35, 61, 70, 79. In all, 380 students took the test. About how many had scores between 35 and 61? a. 26 b. 76 с. 95 d. 190 e. None of these 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? a. -9.20 b. -6.18 6.18 с. d. 7.60 e. 9.20 21. In 1965, the mean price of a new car was $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. a. in 2011
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