Question 2 According to a fast-food manager, the average number of customers between 8am to 11am is 10, with a variance

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Question 2
According to a fast-food manager, the average
number of customers between 8am to 11am is 10, with a variance of
two. His friend from another outlet does not believe that the
variance is two. He counts the number of customers in 15 other
outlets and obtained the data as in Table 2.
Table 2
Outlet
Number of Customers
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
11
10
9
10
10
11
11
10
12
9
7
9
11
10
11
[Total: 20