Experience has shown that one out of every four customers who place an order with an internet retail site make a donation to charity. If we randomly select a sample of 12 customers, what is the probability that less than three will make a donation to charity? Interpret your answer Q.3.3 The time taken to complete a 25km race is normally distributed, with an average time (μ) of 2.30 hours and a standard deviation (σ) of 0.60 hours. What is the probability that a randomly selected participant will:     Q.3.3.1 Take between 2.40 and 2.50 hours to complete the race? Interpret your answer Q.3.3.2 Take between 2.15 and 2.25 hours to complete the race? Interpret your answer.

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Experience has shown that one out of every four customers who place an order with an internet retail site make a donation to charity. If we randomly select a sample of 12 customers, what is the probability that less than three will make a donation to charity? Interpret your answer

Q.3.3 The time taken to complete a 25km race is normally distributed, with an average time (μ) of 2.30 hours and a standard deviation (σ) of 0.60 hours. What is the probability that a randomly selected participant will:    

Q.3.3.1 Take between 2.40 and 2.50 hours to complete the race? Interpret your answer

Q.3.3.2 Take between 2.15 and 2.25 hours to complete the race? Interpret your answer.

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