Question

There are 7 observations in the data and their mean is 11. If each observation is multiplied by
2, then the mean of new observations is

(a) 11 (b) 13 (c) 22 (d) 55

Answer 1

Mean = 11
Number of observations = 7
Sum of observations = 11 $\text{×}$ 7 = 77
Sum of new observations = 2 $\text{×}$ 77 = 154
Mean of new observations = $\frac{154}{7}=22$
Hence, the correct option is (c).