Answered: Experience has shown that one out of…

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.

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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