suppose we roll a very unbalance die: it has Probability 3/2 that is 1 show, and the probability of each of the other numbers 2 through 6 showing is 1/20. (check that there add up to 1.) let X represent the numbers that shows when we roll this die.
-computer the mean and standard deviation for X
-computer the actual Prob. P(mu-kstigma

Question

suppose we roll a very unbalance die: it has Probability 3/2 that is 1 show, and the probability of each of the other numbers 2 through 6 showing is 1/20. (check that there add up to 1.) let X represent the numbers that shows when we roll this die. 
-computer the mean and standard deviation for X
-computer the actual Prob. P(mu-kstigma< X< mu+kstigma) for k=1,2,3.

anonymous · Answer

$$P(\mu-k \sigma <X<\mu - k \sigma)$$