There are 6 observations in a set of data and their mean is 12. If each observation is multiplied by 2, find the new mean.
The mean and standard deviation of 6 observations are 8 and 4 respectively. If each observation is multiplied by 3, find the new mean and new standard deviation of the resulting observations.
There are 3 observations in a set of data and their mean is 10. If each observation is multiplied by 5, find the change in mean. A. 50 B. 150 C. 30 D. 40