Question

The marks obtained by 9 students in a test of 100 marks in Mathematics are given below 64 , 63 , 72 , 65 , 68 , 69 , 66 , 67 , 69 Find the standard deviation of marks obtained by the students .​

Answer 1

Step-by-step explanation:

Arranging the given data in ascending order

20,33,39,40,50,53,59,65,69

Here, n=9(odd)

Median M=Value of 5

th

observation

So, Median is 50.

Now, mean deviation above median=

n

1

∑∣x

i

−M∣

=

9

114

=12.67

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