WAEC - Mathematics (2018 - No. 34)
Find the mean deviation of 20, 30, 25, 40, 35, 50, 45, 40, 20 and 45
8
9
10
12
Explanation
Mean = \(\frac{\sum f x}{\sum f}\)
= \(\frac{350}{10}\)
= 35
= \(\frac{\sum f |d|}{\sum f}\)
= \(\frac{90}{10}\)
= 9
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