Question

the arithmetic mean of 13 observations is calculated as 43. but this is because the observation 87bis misread as 35. find the correct mean​

Answer 1

Answer:

i think the correct mean is 43

Answer 2

Answer:

$\huge{\fbox{\fbox{\bigstar{\mathfrak{\red{Answer}}}}}}$

Mean=sum of observations/ total observations

38=sum/9

38×9=sum

342=sum

If a number is mistakenly written as 72 then 45 should be added to the sum

sum=342

actual sum should be :

342+45

=387

mean=sum/total observations

=387/9

= 43