There are 3 observations in a set of data and their mean is 10. If each observation is multiplied by 5, find the new mean. A. 50 B. 150 C. 100 D. 30
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
Find the mean and variance for the following frequency distribution
Classes0−3030−6060−9090−120120−150150−180180−210Frequency23510352
Or
The mean and standard deviation of six observations are 8 and 4, respectively. If each observation is multiplied by 3, find the mean and new standard deviation of the resulting observations.