Question

Arithmetic mean of 15 observations was calculated as 85. In doing so an observationwas wrongly taken as 73 for 28. What would be correct mean?​

Answer 1

Arithmetic mean = sum of all observation / no. of observation

Now,

According to question

Sum= 85*15

= 1275

And 73 was written instead of 28 while solving.

So we will subtract 73 from the sum

1275 - 73 = 1202

Now we will add 28 to 1202

1202 + 28= 1230

So, correct sum is 1230

Now ,

Mean = 1230÷15

= 82

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