The monthly electrical utility bills of all customers for New River Light and Power are known...
The monthly electrical utility bills of all customers for New River Light and Power are known to be distributed normally with a mean equal to $50 a month and a population standard deviation of $10.
If a single customer is chosen at random, what is the probability that their average bill will exceed $60?
Homework Answers
Solution :
Given that,
Using Empirical rule,
P(
- 1
<
X <
+ 1)
= 68%
P(X > 60) = 1 - P(X < 60)
= 1 - 0.84
= 0.16
Probability = 0.16
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