A group of 10 observations has arithmetic mean 30. If each
observation is increased by 5 and doubled, then the arithmetic
mean will be ....
(a) 65
(b) 70
(c) 25
(d) cannot be obtained
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10 × 30
= 300 = Total
10 x 5 = 50 + 50 = 100
300 + 100 = 400
400 /10
40
ans. 40
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