1. The expenditures (in dollars) of customers at a coffee shop has a distribution that is strongly skewed to the right with mean = 3.50 and standard deviation = 2.00.
2. (e) Suppose 400 customers are randomly selected (assume independence). Find the probability that the total expenditure is less than $1,360. Hint: Restate this problem in terms of the sample mean X .

I need explanation on how to find this as well, Thank you