Question

I need some help on Math

Answer 1

Being that their sample size was 10 makes this slightly more straight forward.

first average the overnight percents
(27 + 32 + 34)/3 = 31

so that is the average percent of users that selected overnight.

then apply your average percent to the customer total

.31 * 2755 = 854.05

rounded 854

Answer 2

First, you would want to find the average percentage of people who use overnight delivery
(27+32+34)/3 = 31%

then multiply the total number of people by 0.31 

2755*0.31 = approx.854 people.