Answered: John charges his cell phone only when…

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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John charges his cell phone only when it is fully drained. The length of time, in hours, between charges of his cell phone is normally distributed with mean 31 and variance 64. Answer the following independent questions.

Suppose that the cell phone lasted 48.84 hours since the most recent charge. z-score for this value

Probability(Cell phone lasts at least 7.72 hours after the last recharge)

Probability(Cell phone will last between 40.52 and 42.92 hours)

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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