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

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

Mean and varience of 5 observations are 4.4 and 8.24 respectively . If three observations are 4,9 and 6, then find remaining observations.

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

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.

The mean and standard deviation of a group of 100 observations were found to be 20 and 3, respectively. Later on it was found that three observations were incorrect, which were recorded as 21, 21 and 18. Find the mean and standard deviation if the incorrect observations are omitted.

Find the median of the observations 13, 9, 15, 8, 6, 3.