Math, asked by sidhusangtar, 1 year ago

the mean of the following distribution is 18 find the frequency f of the class 19 to 21

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Answers

Answered by chandanagalaxy101
19

Answer:

the answer is 8.

Step-by-step explanation:

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Answered by aquialaska
2

Answer:

Value of f is 8

Step-by-step explanation:

Given: Mean of the data = 18

To find: value of f

Formula of mean for continuous series is given by,

\overline{x}=\frac{\sum x_if_i}{\sum f_i}

from attached table we have,

18=\frac{704+20f}{40+f}

18(40+f)=704+20f

720+18f=704+20f

20f-18f=720-704

2f=16

f=8

Therefore, Value of f is 8

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