Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • NCERT
  • Mean of 50 observations was found to be 80.4. But later on, it was discovered that 96 was misread as 69 at one place. Find the correct mean.

Mean of 50 observations was found to be 80.4. But later on, it was discovered that 96 was misread as 69 at one place. Find the correct mean.

Answers (1)

Answer :

 \left [ 80.94 \right ]

\text{Mean}=\frac{\text {sum of all observations}}{\text {No. of observations}}

Mean of 50 observations was found to be 80.4 (Incorrect mean)

The incorrect sum of all the numbers = Incorrect mean \times Total numbers

                                                    =80.4 \times 50=4020

It was discovered that 96 was misread as 69 at one place

Hence the correct sum of all the numbers

= 4020 - 69 + 96 = 4047

So correct mean

\frac{4047}{50}=80.94

Hence, the correct mean is 80.94

Posted by

infoexpert23

View full answer

Similar Questions

Latest Question