Question

The sum of squares of the deviations from the mean of a data containing 15 observations is 60 then the SD is


a)2 b) 3 c) 5 d) 4

Answer 1

Answer:

(d). 4 is ur ans...

Step-by-step explanation:

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Answer 2

Answer:

Given, ∑(x−

x

ˉ

)

2

=250,n=10,

x

ˉ

=50

Thus standard deviation =

n

∑(x−

x

ˉ

)

2

=

25

=5

∴ Coefficient of variation =

x

ˉ

σ

×100=

50

5

×100 % =10%