Question

The mean of the marks scored by 40 students was found to be 35. Later on it was discovered that a score of 43 was misread as 34. Find the correct mean .​

Answer 1

Step-by-step explanation:

$\frac {\Sigma \: xi}{40} = 35 \\ \Sigma \: xi \: = 1400$

Since, 43 is real

as,34

therefore, sum will

be,

$\Sigma \: xi \: - 34 + 43 \\ \Sigma \: ni \: + 9 = 1409 \\ </p><p>n = \frac{1409}{40} = \frac{140.9}{4} \\ = 35.25 \: ans$