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The annual ground coffee expenditures for households are approximately normally distributed with a mean of $...

The annual ground coffee expenditures for households are approximately normally distributed with a mean of $ 41.03 and a standard deviation of $ 10.00 .

a. Find the probability that a household spent less than ​$30.00.

b. Find the probability that a household spent more than ​$55.00.

c. What proportion of the households spent between ​$25.00 and ​$35​.00?

d. 90​% of the households spent less than what​ amount?

Math   Statistics-And-Probability   
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