Mean of twenty observations is 15. If two observations 3 and 14 replaced by 8 and 9 respectively, then the new mean will be

The mean of twenty observations is 15. If two observations 3 and 14 are replaced by 8 and 9 respectively, then what will be the new mean.

Mean of 20 observations is 17. If observation 40 is replaced by 12, then the new mean is

Mean of n observations x_1,x_2 ,…., x_n is barx . If an observation x_q is replaced by x'_q , then the new mean is :

The arithmetic mean of 12 observations is 15. If two observations 20 and 25 are removed then the arithmetic mean of remaining observations is

The mean of 7 observations is 7. If each observation is increased by 2, then the new mean is

The mean of 18 observation is 7 and if each observation 5 is added,then the new mean will be

The mean of 10 observation is 15. If one observation 15 is added, then find the new mean.

Create a set of 8 observations with mean 14.

The mean and variance of a data set comprising 15 observations are 15 and 5 respectively. If one of the observation 15 is deleted and two new observations 6 and 8 are added to the data, then the new variance of resulting data is

The mean of 10 observations is 15. If one observation 15 is added, then the new mean is 16 (b) 11 10 (d) 15