seven students of a group get 20,20,20,20,20,20,20 marks in a test of 25 marks. What is the standard deviation of their marks
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The marks obtained by the group of students are:
81,72,90,90,85,86,70,93,71
Here n=9
∴ Mean (
x
ˉ
)
∑x
i
/n=(81+72+90+90+85+86+70+93+71)/9=738/9=82
Therefore, the mean marks obtained by the group of students is 82
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