SOLUTION: The time required for a citizen to complete the 2000 U.S. Census “long” form is normally distributed with a mean of 40 minutes and a standard deviation of 10 minutes.
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-> SOLUTION: The time required for a citizen to complete the 2000 U.S. Census “long” form is normally distributed with a mean of 40 minutes and a standard deviation of 10 minutes.
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Question 159734: The time required for a citizen to complete the 2000 U.S. Census “long” form is normally distributed with a mean of 40 minutes and a standard deviation of 10 minutes.
9. What proportion of the citizens will require less than one hour?
A) 0.4772
B) 0.9772
C) 0.9974
D) 0.9997
10. The slowest 10% of the citizens would need at least how many minutes to complete the form?
A) 27.2
B) 35.8
C) 56.4
D) 59.6
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1 hr=40+20 min.
20=2 standard deviations
50%+34.1%+13.6%=97.7% B
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10)
10% would be between 1 & 2 SD's on the high side so 56.4 min is about right.
Ed
