The California Municipal Corporation installed 2,000 bulbs in the streets of California. If these bulbs have an average life of 1,000 burning hours, with a standard deviation of 200 hours, what number of bulbs might be expected to fail in the first 700 burning hours? The table of area of the normal curve at selected values is as follows: X-X Sigma Probability 1.00 0.159 12.5 0.106 1.50 0.067

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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The California Municipal Corporation installed 2,000 bulbs in the streets of California. If these bulbs
have an average life of 1,000 burning hours, with a standard deviation of 200 hours, what number of
bulbs might be expected to fail in the first 700 burning hours? The table of area of the normal curve at
selected values is as follows:
X-X
Sigma
Probability
1.00
0.159
12.5
0.106
1.50
0.067
Transcribed Image Text:The California Municipal Corporation installed 2,000 bulbs in the streets of California. If these bulbs have an average life of 1,000 burning hours, with a standard deviation of 200 hours, what number of bulbs might be expected to fail in the first 700 burning hours? The table of area of the normal curve at selected values is as follows: X-X Sigma Probability 1.00 0.159 12.5 0.106 1.50 0.067
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