Question

The mean of 50 observations is 20. On re-checking it is found that two observations were misread as 17 and 33 instead of 47 and 23. Find the correct mean

Answer 1

hello here is your answer
new mean =
$\frac{(2 0\times 50) - (17 + 33) + (47 + 23)}{20 }$
=1020÷20
=51