The mean and variance of eight observations are 9 and 9.25, respectively. If six of the observations are 6, 7, 10, 12, 12 and 13, find the remaining two observations.

The mean and variance of 8 observations are 9 and 9.25 respectively. If six observations are 6, 7, 10, 12, 12 and 13, find the remaining two observations.

The mean and variance of 7 observations are 8 and 16, respectively. If five of the observations are 2, 4, 10, 12, 14. Find the remaining two observations.

The mean and variance of 7 observations are 8 and 16 respectively. If five observations are 2, 4, 10, 12, 14, find the remaining two 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 the mean and variance of a binomial distribution are 9 and 6 respectively, find the number of trials.

The mean of 5 observation is 4.4 and their variance is 8.24 . If three of the observations are 1,2 and 6, find the other two observations

If A.M and G.M of two positive numbers are 13 and 12 respectively. Find the numbers.

The mean and standard deviation of 20 observations are found to be 10 and 2. respectively. On rechecking, it was found that an observation 8 was incorrect. Calculate the correct mean and standard deviation in each of the following cases: (i) If wrong item is omitted. (ii) If it is replaced by 12.