Suppose a brand of light bulbs is normally distributed, with a mean life of 1700 hr and a standard deviation of 50 hr Find the probability that a light bulb of that brand lasts between 1640 hr and 1780 hr. The probability that a light bulb will last between 1640 hr and 1780 hr is . (Type an integer or decimal rounded to four decimal places as needed.)

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Suppose a brand of light bulbs is normally distributed, with a mean life of 1700 hr and a standard deviation of 50 hr.
Find the probability that a light bulb of that brand lasts between 1640 hr and 1780 hr.
The probability that a light bulb will last between 1640 hr and 1780 hr is .
(Type an integer or decimal rounded to four decimal places as needed.)
Transcribed Image Text:Suppose a brand of light bulbs is normally distributed, with a mean life of 1700 hr and a standard deviation of 50 hr. Find the probability that a light bulb of that brand lasts between 1640 hr and 1780 hr. The probability that a light bulb will last between 1640 hr and 1780 hr is . (Type an integer or decimal rounded to four decimal places as needed.)
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