The average price of a college math textbook is $157 and the standard deviation is $30. Suppose that 45 textbooks are randomly chosen. Round all answers to 4 decimal places where possible.What is the distribution of ¯xx¯? ¯xx¯ ~ N(,)For the group of 45, find the probability that the average price is between $154 and $158. Find the third quartile for the average textbook price for this sample size. $ (round to the nearest cent)For part b), is the assumption that the distribution is normal necessary? NoYes

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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 average price of a college math textbook is $157 and the standard deviation is $30. Suppose that 45 textbooks are randomly chosen. Round all answers to 4 decimal places where possible.

What is the distribution of ¯xx¯? ¯xx¯ ~ N(,)
For the group of 45, find the probability that the average price is between $154 and $158.
Find the third quartile for the average textbook price for this sample size. $ (round to the nearest cent)
For part b), is the assumption that the distribution is normal necessary? NoYes

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