Find the mean of x + 3, x + 5, x + 7, x + 9 and x + 11.
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Find the mean of first ten odd natural numbers.
Find the mean of all factors of 10.
The mean of 15 observations is 32. Find the resulting mean, if each observation is :
(i) increased by 3
(ii) decreased by 7
(iii) multiplied by 2
(iv) divided by 0.5
(v) increased by 60%
(vi) decreased by 20%