Mathematics - Statistics Question with Solution | TestHub

MathematicsStatisticsMeanEasy2 minPYQ_2016
MathematicsEasysingle choice

The mean of5observations is5and their variance is12.4. If three of the observations are1,2 & 6; then the value of the remaining two is :

Options:

Answer:
C
Solution:

x+y+1+2+65=5

x+y=16

Now 12.4=16+9+1+x-52+y-525

62 =26+x-52+y-52

36=x-52+y-52

Shifting of the origin to 5,5 the equations will become 

62=x2+y2 and x+y=6

Solving them and again will get the x=0 or y=0.

If x=0y=6 or

If y=0x=6.

But by shifting the origin back to original position, we get x=0+5=5 & y=6+5=11

(or)

x=6+5=11 & y=0+5=5

Hence, the values of the remaining two are 5, 11.

Stream:JEESubject:MathematicsTopic:StatisticsSubtopic:Mean
2mℹ️ Source: PYQ_2016

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