12. The average waiting time to be seated for dinner at a popular restaurant is 23.5 minutes, with a standard deviation of 3.6 minutes. Assume the variable is normally distributed. When a patron arrives at the restaurant for dinner, find the probability that the patron will have to wait the following time. a. Between 15 and 22 minutes b. Less than 18 minutes or more than 25 minutes

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Answer 12-15 only
II.
Applications of Normal Distributions.
erage number of calories in a 1.5-ounce chocolate bar is 225. Suppose that the distribution
mately normal with s =10. Find the probability that a rene
plate
1
of calories S
bar will have;
a. Between 200 and 220
an 200 calories
b. L
12. The average waiting time to be seated for dinner at a popular restaurant is 23.5 minutes, with a
standard deviation of 3.6 minutes. Assume the variable is normally distributed. When a patron arrives
at the restaurant for dinner, find the probability that the patron will have to wait the following time.
a. Between 15 and 22 minutes
b. Less than 18 minutes or more than 25 minutes
13. To qualify for a police academy, applicants are given a test of physical fitness. The scores are
normally distributed with a mean of 64 and a standard deviation of 9. If only the top 20% of the
applicants are selected, find the cutoff score.
14. The mean lifetime of a wristwatch is 25 months, with a standard deviation of 5 months. If the
distribution is normal, for how many months should a guarantee be made if the manufacturer does
not want to exchange more than 10% of the watches?
Assume the variable is normally distributed.
15. To help students improve their reading, a school district decides to implement a reading program.
It is to be administered to the bottom 5% of the students in the district, based on the scores on a
reading achievement exam. If the average score for the students in the district is 122.6, find the cutoff
score that will make a student eligible for the program. The standard deviation is 18. Assume the
variable is normally distributed.
Transcribed Image Text:II. Applications of Normal Distributions. erage number of calories in a 1.5-ounce chocolate bar is 225. Suppose that the distribution mately normal with s =10. Find the probability that a rene plate 1 of calories S bar will have; a. Between 200 and 220 an 200 calories b. L 12. The average waiting time to be seated for dinner at a popular restaurant is 23.5 minutes, with a standard deviation of 3.6 minutes. Assume the variable is normally distributed. When a patron arrives at the restaurant for dinner, find the probability that the patron will have to wait the following time. a. Between 15 and 22 minutes b. Less than 18 minutes or more than 25 minutes 13. To qualify for a police academy, applicants are given a test of physical fitness. The scores are normally distributed with a mean of 64 and a standard deviation of 9. If only the top 20% of the applicants are selected, find the cutoff score. 14. The mean lifetime of a wristwatch is 25 months, with a standard deviation of 5 months. If the distribution is normal, for how many months should a guarantee be made if the manufacturer does not want to exchange more than 10% of the watches? Assume the variable is normally distributed. 15. To help students improve their reading, a school district decides to implement a reading program. It is to be administered to the bottom 5% of the students in the district, based on the scores on a reading achievement exam. If the average score for the students in the district is 122.6, find the cutoff score that will make a student eligible for the program. The standard deviation is 18. Assume the variable is normally distributed.
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