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?

The variance of 20 observation is 5. If each observation is multiplied by 3, then what is the new variance of the resulting observation?

The mean of 11 obervation is 50. If the mean of first Six observation is 49 and that of last six observation is 52, then find sixth observation.

If the mean of 10 observation is 50 and the sum of the square of the deviations of observation from the mean is 250, then the coefficient of variation of these observation is

When HNO_(3) is added to sodium ferrocyanide, which of the following observation is observed ?

If an observer is moving with respect to a stationary electron, then he observes