Originally Posted by

**chardukian** I am unsure how to finish this problem.

" The weekly amount spent by a company for travel has approximately a normal distribution with mean = $550 and standard deviation = $40. What is the probability that the actual expenses will exceed $570 in 20 or more weeks during the next year? (Suppose there are 52 weeks next year.)

I know this is an approximation of normal distribution binomial but am unsure how to set it up. I started with

z= x-550/40, but am unsure of the next steps to take. Can anyone help explain the next steps to take? Thanks.