Assume that the electric bills of Southern California Edison are normally distributed with a mean of...
Assume that the electric bills of Southern California Edison are normally distributed with a mean of $100 and a standard deviation of $15. Find the bill amount such that 20% of the households have a bill higher than this amount.
Homework Answers
Consider, X= the electric bills of Southern California Edison
P[X>a ] = 0.20
Z value associated with upper 20% area under standard normal curve is Z=0.8416
Therefore,
=112.62
i.e. $112.62
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