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Question
If the mean of frequency distribution is 34.9, Σfixi = 1000 + a, Σfi = 30 then the value of a = ______.
Options
47
48
42
45
MCQ
Fill in the Blanks
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Solution
If the mean of frequency distribution is 34.9, Σfixi = 1000 + a, Σfi = 30 then the value of a = 47.
Explanation:
Mean = `(Σf_i x_i)/(Σf_i)`,
So, Σfixi = 34.9 × 30
= 1047
Given Σfixi = 1000 + a,
We have 1000 + a = 1047
⇒ a = 47
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