Question

for a given set of 100 observations mean was calculated to be 55 afterwards it was noticed that one observation 50 was wrongly taken as 60 find the correct average​

Answer 1

Step-by-step explanation:

mean of 100 observations = 55

Total of 100 observations = 5500

Total of 99 observations = 5500 -50 = 5450

Total of corrected 100 observations = 5450 + 60 = 5510

the correct average = 5510 / 100 = 55.1

Answer 2

Answer:

no of observation(x)= 100

mean= 55

therefore,

sum of X = 55×100=5500

now,

correct sum of x= wrong sum of x -wrong observation +correct observation

wrong sum of x = 5500

wrong observation= 60

correct observation= 50

therefore,

correct sum of.x = 5500-60+50

= 5490

therefore,

correct avg = 5490÷ 100= 54.90