Find the mean deviation of 20, 30, 25, 40, 35, 50, 45, 40, 20 and 45
A.
8
B.
9
C.
10
D.
12
Correct answer is B
Mean = \(\frac{\sum f x}{\sum f}\)
= \(\frac{350}{10}\)
= 35
= \(\frac{\sum f |d|}{\sum f}\)
= \(\frac{90}{10}\)
= 9