Question

mean of y-2a ,y-a,y,y+a , y-2a is options y ,not possible without the value of a, 5y,a
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Answer 1

Question -> mean of y - 2a , y - a , y , y + a , y + 2a is

1. y
2. not possible without the value of a
3. 5y
4. a

solution : we know, mean is the ratio of sum of observations to the total observations.

i.e., mean = sum of observations/total observations

⇒mean = (y - 2a + y - a + y + y + a + y + 2a)/5

= (5y - 5a + 5a)/5

= 5y/5 = y

Therefore the mean of given observations is y.

so option (1) is correct choice.

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