The variance of 10 observations is 16 and their mean is 12. If each observation is multiplied by 4, what is new standard deviation-

The variance of 10 observations is 16 and their mean is 12. If each observation is multiplied by 4, what is the new mean-

The standard deviation of 25 observations is 4 and their mean is 25. If each observation is increased by 10, what is the new variance-

The standard deviation of 25 observations is 4 and their mean is 25. If each observation is increased by 10, what is the new mean-

Consider the following statements : (i) Mean of 100 observations is 50 and standard deviation is 10. If 5 is added to each observation the new mean and standard deviation are 55, 10. (ii) Mean of 100 observations is 50 and standard deviation is 10. If each observation is multiplied by 3 then the new mean and standard deviation are 50, 10/3. The true statements are :

Consider the following statements : (i) Mean of 100 observations is 50 and standard deviation is 10. If 5 is added to each observation the new mean and standard deviation are 55, 10. (ii) Mean of 100 observations is 50 and standard deviation is 10. If each observation is multiplied by 3 then the new mean and standard deviation are 50, 10/3. The true statements are :

The mean and standard deviation of 6 observations are 8 and 4 respectively . If each observation is multiplied by 2, find the new mean and new standard deviation of the resulting observation.

The standard deviation of 20 observations is sqrt(5) . If each observation is multiplied by 2 , find the standard deviation and variance of the resulting observations.

(b)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.