The amount of time spent commuting one-way to university by students follows a normal distribution with a mean of 22 minutes and a standard deviation of 7 minutes. a) If a student is randomly selected, what is the probability that it will take the student more than 18 minutes to commute to the university? b) A university researcher wishes to know the time, t, where less than 18% of the students take to commute to the university. c) If a random sample of 121 students are randomly selected, what is the probability that the mean commuting time for the sample is between 23 and 24 minutes?
The amount of time spent commuting one-way to university by students follows a normal distribution with a mean of 22 minutes and a standard deviation of 7 minutes. a) If a student is randomly selected, what is the probability that it will take the student more than 18 minutes to commute to the university? b) A university researcher wishes to know the time, t, where less than 18% of the students take to commute to the university. c) If a random sample of 121 students are randomly selected, what is the probability that the mean commuting time for the sample is between 23 and 24 minutes?
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 8CR
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