8.5 Challenging Integral Applications
Question #4 (Medium): Normal Distribution
Normal distribution has its probability density function as , where is the mean
and the standard deviation.
Average amount of money spent on groceries for a single adult is shown to be $300 per month with
standard deviation of $80 according to a random city survey, and it is normally distributed.
1) What is the probability that an adult chosen at random spends over $500 per month?
2) What percentage of the city population spend less than $200 on groceries