Question

the mean of 10 observations is 20 if one observation 10 is deleted find the mean of remaining observations​

Answer 1

Answer:

mean of 10 observation = 20

sum of 10 observation/10 = 20

sum of 10 observation = 200

subtract 10 from both sides

sum of 9 observation = 190

(now number of observation is 9)

sum of 9 observation/9 = 190/9

mean of 9 observation = 21.1

hope this will help you