Question

The manager of a supermarket records the waiting times of 100 customers.

He wishes to calculate an estimate for the mean waiting time.
He draws this table.
Waiting Time
Number of
Midpoint (x)
fx
(minutes)
customers (0)
0-
0.5
5
2.5
1 -
1.5
28
42
2 -
2.5
32
80
3.5
26
91
3-
4-5
4.5
9
40.5
100
256
a) Complete the table.
b) Calculate an estimate for the mean. (I JUST NEED HELP ON B)

Answer 1

2.4

Explanation:

Answer 2

2.56

Explanation:

you add all the columns up to get an answer of 256 and divide it by 100=2.56