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The monthly utility bills in a city are normally​ distributed, with a mean of ​$100 and...

The monthly utility bills in a city are normally​ distributed, with a mean of ​$100 and a standard deviation of ​$14. Find the probability that a randomly selected utility bill is​ (a) less than ​$67​, ​(b) between ​$84 and ​$90​, and​ (c) more than ​$120.

Math   Statistics-And-Probability   
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Answer #1

Given mean = 100 and SD = 14

a) the probability that a randomly selected utility bill less than ​$67 is

b) the probability that a randomly selected utility bill is lies between $84 and $90 is

c)  the probability that a randomly selected utility bill more than ​$120 is

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