Question

mean of 25 observations is 36 and the mean of first 13 of the observation is 32 and the mean of last 13 observation is 39 find the 13th observation.

Answer 1

Hii...

mean=addition of 25 observations/total no. of observations(25)

36=x/25

addition=36*25=900

according to second condition,

32=y/13
addition of 1st 13 observations=13*32=416

39=Z/13
addition of last 13 observations=39*13=507


13th observation=(y+Z)-x
===============(416+507)-900

================923-900====23

Answer 2

mean of 25 observations is 36 and the mean of first 13 of the observation is 32 and the mean of last 13 observation is 39 find the 13th observation.