Question

If the mean of frequency distribution is 8.1 and Σfixi = 132 + 5k, Σfi = 20, then k =
(a)3
(b)4
(c)5
(d)6

Answer 1

SOLUTION :  

The correct option is (d) : 6

Given : MEAN of the frequency distribution = 8.1 , Σfixi = 132 + 5k , Σfi = 20  

MEAN =  Σfixi /Σfi

8.1 = (132 + 5k) / (20)

20 × 8.1 = 132 + 5k

162 = 132 + 5k

5k = 162 - 132  

5k = 30

k = 30/5 = 6  

k = 6  

Hence, the value of k is 6 .

HOPE THIS ANSWER WILL HELP YOU……

Answer 2

I hope it is helpful...


So correct option is (D)