Question

152. The mean of a certain
certain number of
observations is 35. What is the new value of
the mean if each observation is :
(i) increased by 7. (ii) decreased by 5.
(iii) multiplied by 2. (iv) divided by 5.
(v) increased by 20%.
(vi) decreased by 30%.
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Answer 1

Answer:

Mean of n observations = 35 Sum of n observations = 35n If each observation is increased by 7 New sum = 35n + 7n = 42n thus, new mean = 42n/n = 42