Question

Find the missing frequency from the following data, if arithmetic mean is 25.4.

Class-

Interval

10-20 20-30 30-40 40-50 50-60

Frequency 20 15 10 ? 2​

Answer 1

Answer:

Ok here is your answer

Explanation:

Let the missing no. be x

therefore,20+15+10+2+x/5=25.4

or,47+x/5=25.4

or, 9.4+x/5=25.4

or, x/5=25.4-9.4

or, x=16*5=80

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