Let denote the complement of an event
be any pair wise independent events with
and
then
equal to:
The mean and the standard deviation (s.d.) of 10 observations are 20 and 2 respectively. Each of these 10 observations is multiplied by p and then reduced by q, where and
If the new mean and new s.d. become half of their original values, then q is equal to :
Let A and B be two independent events such that and
. Then, which of the following is TRUE?