Observation of Prafull Billore | MBA CHAI WALA

Observations

The median of 27 observations of a variable is 18.Three more observations are made and the values of these observations are 16,18 and 50 . What is the median of these 30 observations?

If the mean of m observations out of n observations is n and the mean of remaining observations is m, then what is the mean of all n observations ?

The average of n observation is 40. If two observation of 50 and 60 are added, then the average of all the observations will be 41. What is the value of n?

In a set of 2n distinct observation,each of the observation below the median of all the observations is increased by 5 and each of the remaining observations is decreased by 3 . Then the mean of the new set of observations:

The variance of 20 observation is 5. If each observation is multiplied by 2, then what is the new variance of the resulting observation?

The variance of 20 observation is 5. If each observation is multiplied by 2, then what is the new variance of the resulting observation?