Question

the arithmetic mean of 200 values was calculated and it was 37.5 but on rechecking 1 value was missed the mean was 38.1 then find the value??​

Answer 1

Formula used:

Mean= sum of observations/number of observations

Answer:

incorrect mean = 37.5

37.5 = sum of observations/200

sum of observations = 7500

ATQ

on rechecking 1 value was missed let it be x

Now correct mean = 38.1

38.1 = 7500+x/200 (where x is missed value)

7620 = 7500+x

x = 7620-7500

x= 120

hence 120 is required answer