statistics
posted by Anonymous on .
A sample of purchases at the local convenience store has resulted in the following sample data, where x = the number of items purchased per customer and f = the number of customers.
x= 1,2,3,4,5
f=8, 20, 8, 8, 7
What does the 20 stand for in the above table?
Find the midrange of items purchased.
How many items were purchased by the customers in this sample?
Please show work!

20 people bought 2 items each.
Midrange looks like 3 for x.
∑(f*x) = (8*1) + (2*20) +…. = ?