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Subject - Mathematics:

General

MCQ - 359-9091

Question:

Find the mean of the following frequency distribution using step deviation method

1 Dup 1 -31009604

  1. 148.61
  2. 149.61
  3. 144.62
  4. 149.61

Correct Answer: A

Explanation:

Let us first calculate the mid-values(xi) for each class-interval, By using the formula

4 -46697964
Let us assume the assumed mean(a) = 75 and from that, we get the data as shown in above table. And we know, By step-deviation method
3 -88539984
Where, a = assumed mean h = class size
2 -29200252

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