Question

the mean of 10 observation is 45. which number should be added so that mean becomes 47​

Answer 1

Answer:

mean of 10 observation=45

We have to make mean 47

Explanation:

To make mean 47 we have to add 1 term in it

so no. of terms=11

divide 47 by 11

4.27

so 4.27 should be added.

Answer 2

Explanation:

mean of 10 observations = 45

sum of these 10 observations = 45 × 10

= 450

let we add = x

then

mean of 11 observations= 47

sum of 11 observations = 47× 11

450+x = 517

x= 517 - 450

= 67 ans