posted by Lesley .
A study conducted by a TV station showed the number of televisions per household and the corresponding probabilities for ecach. Find the mean, variance, and standard deviation.
Number of televisions
1 2 3 4
0.32 0.51 0.12 0.05
If you were talking a survey on the programs that were watched on television, how many program diaries would you send to ecach household in the survey?