Find the mean deviation of 20, 30, 25, 40, 35, 50, 45, 40, 20 and 45

  • A 8
  • B 9
  • C 10
  • D 12
waec 2018mathematics

The correct answer is B. 9

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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