Question

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

Answer 1

Answer:

the answer is 8.

Step-by-step explanation:

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Answer 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