If each observation is multiplied or divided by a non-zero number a; then mean is also multiplied or divided by a.

The mean of a set of 30 observations is 75 . if each observations is multiplied by a non zero number lamda and then each of them is decreased by 25 . Their mean remains the same. Then lambda is equal to

The mean of a set of 30 observations is 75. If each observation is multiplied by a non-zero number lambda and then each of them is decreased by 25 their mean remains the same. Then lambda is equal to:

The mean of a set of 30 observations is 75. If each observation is multiplied by non zero number lambda and then each of them is decreased by 25.Their mean remains the same then lambda is equal to

Consider the following statements : 1. If each term of a GP is multiplied by same non-zero number, then the resulting sequence is also a GP. 2. If each term of a GP is divided by same non-zero number, then the resulting sequence is also a GP. Which of the above statements is/are correct?

The mean and standard deviation of 6 observations are 8 and 4 respectively . If each observation is multiplied by 2, find the new mean and new standard deviation of the resulting observation.

The mean of 10 observations is 5.5. If each observation is multiplied by 4 and subtracted from 44, then what is the new mean ?