Question

The mean of 25 observation is 36 out of these observation if the mean of first 13 observation is 32 and that of the last 13 observation is 40 then find the 13 observation

Answer 1

Hlo friend.. Cutiepie Here.

Nice question.

Here is ur answer :

Given, mean of 25 observations = 36

Sum of 25 observations = 36 × 25 = 900.

Now, the mean of 13 observation = 32.

Sum of first 13 observation= 13 × 32 = 416.

The mean of last 13 observations = 40

Sum of last 13 observations = 40 × 13 = 520.

So the 13 th observation

= ( sum of last 13 observations + sum of first 13 observations) - (sum of 25 observations)

= ( 520 + 416) - ( 900)

= 936 - 900

= 36.

Hence, the 13th observation = 36.

___________

HOPE IT HELPS YOU..

Answer 2

Answer:

mean of 25 observation = 36

sum of observation=36×25

900

mean of 13observation =32

sum of obs =13 ×32

146

mean of 13 obs =40

sum of obs=13×40

520

[416+520]-900

960-900

36

hope it will help u