Answered: Orders at a certain bookstore are…

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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Question

Orders at a certain bookstore are normally distributed with a mean order amount of $156 and a standard deviation of $37. We are looking at orders of less than $85 following the two parts below:
a) Convert the 85 dollars to a z-score using the appropriate formula.
b) Work out which percent of these online orders are less than $85.
(Round the percent answer to one decimal place.)

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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