Mean of a finite number of observations is 5. if each observation is mutliplied by 2.find the new mean.

The variance of 20 observations is 5. If each observation is multiplied by 2, find the new variance of the resulting observations.

The mean and standard deviation of six 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.

If each observation of the data is increased by 5, then their mean

The mean of first 8 observations is 18 and last 8 observations is 20. if the mean of all 15 observations is 19, find the 8th observations.

The mean of 100 observations is 50. If one of the observations which was 50 is replaced by 150, the resulting mean will be :

The mean of 10 number is 25. if 5 is subtracted from each other find the new mean.

If each observation of a data is increased by 3, then what about the new man?

If the mean of 8 observations be 15 and 2 be added to each observation, then the mean of new set of observations will be .