Question

41. Mean of five observations
X, X+2, X+6, X+4, X+8 is 11.
Then mean of first three observations is.
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Answer 1

Answer:

Step-by-step explanation:

X+x+2+x+6+x+4+x+8/5=11 (given)

5x+20=55

5x=35

X=7

Now,mean of first three observations

X+x+2+x+6/3=7+9+13/3

=>29/3

Answer 2

first we find x.

x+(x+2)(x+6)+(x+4)+(x+8)/5=11.

therefore,5x+20=11.

5x=11-20

x=-9/5

x=-1.8

therefore,sum of first 3 observations is:

1.8 +(1.8+2)+(1.8+6)

=1.8+3.8+7.8

=13.4 is the mean.

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