The lifespan of 150 bulbs are found to be normally distributed with mean of 700 hours and standard deviation of 80 hours. What is the probability that the bulbs will last for__? a. more than 860 hours b. less than 844 hours c. between 644 and 852 hours

The lifespan of 150 bulbs are found to be normally distributed with mean of 700 hours and standard deviation of 80 hours. What is the probability that the bulbs will last for__? a. more than 860 hours b. less than 844 hours c. between 644 and 852 hours

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

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.5: Comparing Sets Of Data

Problem 14PPS

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Question

4. The lifespan of 150 bulbs are found to be normally distributed with mean of 700 hours and standard deviation of 80 hours. What is the probability that the bulbs will last for__?

a. more than 860 hours
b. less than 844 hours
c. between 644 and 852 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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