Asked by Heidi
The life of an electric light bulb is known to be normally distributed with a mean of 2000 hours and a std. of 120 hours. Find the probability that the life of such a bulb would be.
(a) greater than 2150 hours
(b) within the range of 1850 hours to 2090 hours
(a) greater than 2150 hours
(b) within the range of 1850 hours to 2090 hours
Answers
Answered by
PsyDAG
Z = (score-mean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions/probabilities related to the Z scores.
a. in smaller portion
b. Between Z scores and mean
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions/probabilities related to the Z scores.
a. in smaller portion
b. Between Z scores and mean
Answered by
Anonymous
m;m
Answered by
Kehkshan Shahid
0.7768
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