For a group of 200 students, the mean and standard deviation of the ma

1.	For a group of 200 students, the mean and standard deviation of the marks are 40 and 15. Find the sum of the squares of the marks.
Answer» Step-by-step explanation: Incorrect mean is . There are candidates. So, This is incorrect as was misread as . Corect Correct mean Now, we will FIND the correct STANDARD DEVIATION. We KNOW, When incorrect observations was present, then standard deviation was . This is the SUM when observations were incorrect. Correct sum Correct So, the correct standard deviation is .

For a group of 200 students, the mean and standard deviation of the marks are 40 and 15. Find the sum of the squares of the marks.

Answer»

Step-by-step explanation:

Incorrect mean is

. There are

candidates.

So,

This is incorrect

was misread as

Corect

Correct mean

Now, we will FIND the correct STANDARD DEVIATION.
We KNOW,

When incorrect observations was present, then standard deviation was

This is the SUM when observations were incorrect.

Correct sum

Correct

So, the correct standard deviation is

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For a group of 200 students, the mean and standard deviation of the marks are 40 and 15. Find the sum of the squares of the marks.​

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For a group of 200 students, the mean and standard deviation of the marks are 40 and 15. Find the sum of the squares of the marks.