Marks scored by some children in an arithmetic test are:5, 3, 6, 9, 4, 7, 8, 6, 2, 7, 8, 4, 5, 2, 1, 0, 6, 9, 0, 8.
The arithmetic mean of the marks is

A.
6 
B.
5 
C.
8 
D.
7 
E.
10
Correct Answer: Option B
Explanation
Add all the No.s together to give 100
(sum)xf = 100
N = 20
x = (frac{sum xf}{N})
= (frac{100}{20})
= 5