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The amount of time that a drive-through bank teller spends on a customer is a random variable with a mean μ = 3.8 minutes and a standard deviation o=1.8 minutes. If a random sample of 81 customers is observed, find the probability that their mean time at the teller's window is (a) at most 3.4 minutes; (b) more than 4.1 minutes; (c) at least 3.8 minutes but less than 4.0 minutes. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. (a) The probability that the mean time is at most 3.4 minutes is 0.0228 (Round to four decimal places as needed.) (b) The probability that the mean time is more than 4.1 minutes is 0.0668 (Round to four decimal places as needed.) (c) The probability that the mean time is between 3.8 minutes and 4.0 minutes is 0.3413 (Round to four decimal places as needed.)

The amount of time that a drive-through bank teller spends on a customer is a random variable with a mean μ = 3.8 minutes and a standard deviation o=1.8 minutes. If a random sample of 81 customers is observed, find the probability that their mean time at the teller's window is (a) at most 3.4 minutes; (b) more than 4.1 minutes; (c) at least 3.8 minutes but less than 4.0 minutes. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. (a) The probability that the mean time is at most 3.4 minutes is 0.0228 (Round to four decimal places as needed.) (b) The probability that the mean time is more than 4.1 minutes is 0.0668 (Round to four decimal places as needed.) (c) The probability that the mean time is between 3.8 minutes and 4.0 minutes is 0.3413 (Round to four decimal places as needed.)

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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The amount of time that a drive-through bank teller spends on a customer is a random variable with a mean u = 3.8 minutes and a standard deviation o=1.8 minutes. If a random sample of 81 customers is observed, find the probability that their mean time at the teller's window is (a) at most 3.4 minutes, (b) more than 4.1 minutes: (c) at least 3.8 minutes but less than 4.0 minutes. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. (a) The probability that the mean time is at most 3.4 minutes is 0.0228 (Round to four decimal places as needed.) (b) The probability that the mean time is more than 4.1 minutes is 0.0668 (Round to four decimal places as needed.) (c) The probability that the mean time is between 3.8 minutes and 4.0 minutes is 0.3413 (Round to four decimal places as needed.)
Transcribed Image Text:The amount of time that a drive-through bank teller spends on a customer is a random variable with a mean u = 3.8 minutes and a standard deviation o=1.8 minutes. If a random sample of 81 customers is observed, find the probability that their mean time at the teller's window is (a) at most 3.4 minutes, (b) more than 4.1 minutes: (c) at least 3.8 minutes but less than 4.0 minutes. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. (a) The probability that the mean time is at most 3.4 minutes is 0.0228 (Round to four decimal places as needed.) (b) The probability that the mean time is more than 4.1 minutes is 0.0668 (Round to four decimal places as needed.) (c) The probability that the mean time is between 3.8 minutes and 4.0 minutes is 0.3413 (Round to four decimal places as needed.)
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