Answered: According to a website, the mean number…

Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015

1st Edition

ISBN:9781680331141

Author:HOUGHTON MIFFLIN HARCOURT

Publisher:HOUGHTON MIFFLIN HARCOURT

Chapter11: Data Analysis And Displays

Section: Chapter Questions

Problem 5CR

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Question

How many apps? According to a website, the mean number of apps on a smartphone in the United States is

90. Assume the number of apps is normally distributed with mean

90 and standard deviation 30

Part: 0 / 2

0 of 2 Parts Complete

Part 1 of 2

(a) What proportion of phones have between

and

150

apps? Round the answer to four decimal places.

The proportion of phones that have between

and

150

apps is

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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