How many apps? According to a website, the mean number of apps on a smartphone in the United States is 87 Assume the number of apps is normally distributed with mean 87 and standard deviation 30 . Part: 0 / 2 0 of 2 Parts Complete Part 1 of 2 (a) What proportion of phones have more than 137

How many apps? According to a website, the mean number of apps on a smartphone in the United States is 87 Assume the number of apps is normally distributed with mean 87 and standard deviation 30 . Part: 0 / 2 0 of 2 Parts Complete Part 1 of 2 (a) What proportion of phones have more than 137

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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Question

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

87 Assume the number of apps is normally distributed with mean

87 and standard deviation

Part: 0 / 2

0 of 2 Parts Complete

Part 1 of 2

(a) What proportion of phones have more than

137

apps? Round the answer to four decimal places.

The proportion of phones that have more than

137

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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