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w7_Norm_post

# w7_Norm_post - A random sample of 100 students was taken(a...

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(2000, Q2) Suppose that the monthly income of five-person families in a city is normally distributed, with a mean of \$25,000 and a standard deviation of \$4,000. (a) What percentage of five-person families earn between \$24,000 and \$30,000 per month? (b) To apply for public housing, the monthly income must not exceed the maximum income limit. What is the maximum income limit for five-person families so that the percentage of eligible families is 10%? (c) Suppose that a five-person family is eligible to apply for financial assistance if its monthly income is less than \$18,000. i. What is the proportion of eligible families? ii. If 20 families are selected at random from a large district, what is the probability that there are more than 2 eligible families?

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(2000, Q4) Suppose that half of all students in campus dormitories are dissatisfied with the food service.
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Unformatted text preview: A random sample of 100 students was taken. (a) What is the probability that more than 30 students in the sample were dissatisfied with the food service? (b) What is the probability that the number of students in the sample who were dissatisfied with the food service was between 46 to 52? (2003, Q5) The amount of time necessary to travel to Japan from Hong Kong is assumed to be a normal distribution with mean 5 hours and a standard deviation of 0.25 hour. a. What is the probability that it will take between 4.5 and 5 hours? b. Give the range of values symmetric about the mean such that the probability that the travel time is within that range is 80%....
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w7_Norm_post - A random sample of 100 students was taken(a...

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