plz somebody quick help me out with this one today is my exam..
Attachments:
Answers
Answered by
1
The mean or average increases or decreases by 'k', if each(and every) term is increased or decreased by 'k'.
Hence (i) : the mean becomes 35, when increased by 3
(ii): the mean becomes 25, when decreased by 7.
A simple illustration:
The mean of '15' observations is 32, implies even if we replace the actual values by '15', our mean remains the same. That is, we can assume all our 15 observations as '32'. Now since each value is increased by 3, it means each of our 15 values become '35' and the mean of (35*15/15) is '35'.
Hope it helps
Hence (i) : the mean becomes 35, when increased by 3
(ii): the mean becomes 25, when decreased by 7.
A simple illustration:
The mean of '15' observations is 32, implies even if we replace the actual values by '15', our mean remains the same. That is, we can assume all our 15 observations as '32'. Now since each value is increased by 3, it means each of our 15 values become '35' and the mean of (35*15/15) is '35'.
Hope it helps
myselfyiri:
but it has asked that if each observation was increased or decreased n not the mean
oh yeah thanks
no option has come... but when it will come I'll see to it..
tysm
Similar questions