Question

mean of 8 observations is 25 if one observation 11 is excluded then find the mean of the remaining

Answer 1

mean = sum of all observations / total number of observations (let x be the sum of all observations )
and
total observations=8 ,
mean = 25
one observation = 11

now ,
x/8 = 25
x=25×8
x=200

now ,
new mean =( 200–11) / 7
=189/7
=27... ans

Answer 2

Answer:

27

Step-by-step explanation:

Mean of 8 observation =25

Sum of 8 observation =25X8=200

Excluded observation =11

Sum of 7 observation =200-11=189

Mean of 7 observation =189/7=27