Q. An company wants retain customers To achieve this goal, the company plans to offer a 10% discount on the premium for customers with the lowest 20% of annual expenses. If the average annual expenses for a family of 4 is $3,450 with a standard deviation of $955, what is the amount of the maximum expense that will qualify for the proposed discount?

Answer needed: so my sigma is 995 and my mu is 3450 how do i find for x? what is the maximum expense