Question

The mean of 7 no. Is 42 if one number is excluded their mean becomes 39 what is the excluded no.

Answer 1

Answer:

The required number is 60

Step-by-step explanation:

let the excluded number be x

so, 42 = sum of 7 numbers/7

42 x 7 = sum of 7 numbers

294 = sum of 7 numbers

now ,

39 = sum of 6 numbers/6

39 x 6 = sum of 6 numbers(excluding x)

234 = sum of 6 numbers

so we can say

x = 294 - 234

x = 60

Answer 2

Answer: 60

Step-by-step explanation: Mean of 7 numbers = 42

As 1 number is excluded,

So mean of 6 numbers = 39

Therefore, value of the excluded number =

( 7 x 42 ) - ( 6 x 39 )

= 294 - 234

= 60