find mean and variance

Question

A computer can generate random numbers which are either 0 or 2. On a particular occasion, it generates a set of numbers which consists of 23 zeros and 17 twos. Find the mean and variance of this set of 40 numbers.

Answer 1

?????????????????????? "meen" ??????????????????? yu must want the AVERAEJ... 23*0 + 17*2=34... 34/40=0.85...AVERAEJ=0.85... tu get varians, yu first get sum av distans^2 from the averaej... 23*(0.85)^2 +17*(2-0.85)^2... 23*0.7225 +17*(1.15)^2... =23*0.7225 +17*1.3225... =16.6175 +22.4825... =39.1... varians=39.1/40=0.9775