According to a website, the mean number of apps on a smartphone in the United States is 85. Assume the number of apps is normally distributed with mean 85 and standard deviation 23. What proportion of phones have fewer than 99 apps? Round the answer to four decimal places. The proportion of phones that have fewer than 99 apps is .

According to a website, the mean number of apps on a smartphone in the United States is 85. Assume the number of apps is normally distributed with mean 85 and standard deviation 23. What proportion of phones have fewer than 99 apps? Round the answer to four decimal places. The proportion of phones that have fewer than 99 apps is .

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.4: Distributions Of Data

Problem 3GP

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Question

According to a website, the mean number of apps on a smartphone in the United States is 85. Assume the number of apps is normally distributed with mean 85 and standard deviation 23.

What proportion of phones have fewer than 99 apps? Round the answer to four decimal places.

The proportion of phones that have fewer than 99 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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