Find the mean deviation of 20, 30, 25, 40, 35, 50, 45, 40, 20 and 45
A
8
B
9
C
10
D
12
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
Mean = \(\frac{\sum f x}{\sum f}\)
= \(\frac{350}{10}\)
= 35
= \(\frac{\sum f |d|}{\sum f}\)
= \(\frac{90}{10}\)
= 9
Source: Myschool Past Questions Archive (Record #49462)