Q15) Find out mean of the following distribution ITEMS | 0-5 FREQUENCY | 2 | 5-10 10-15 15-20 | 20-251 25-30 130-351 35-40 5 | 7 | 13 21 16 | 8 | 3

Answers 1

Answer:

Explanation:

The formula used for arithmetic mean of grouped data by step deviation method is,

=A+

∑f

∑fu

×i

A= Assumed mean of the given data

∑ = Summation of the frequencies given in the grouped data

∑fu = Summation of the frequencies and deviation of a given mean data

(x−A)

i= Class interval width

= arithmetic mean

=22.5+

105

172

×5

=22.5+8.19

=30.69 ≈ 31

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