Theres 3 cups of vinegar and 8 fluid ounces in 1 cup and 2 tablespoons in 1 fluid ounce, how many tablespoons are in 1

42

As you must be knowing, the formula for x successes in n trials in a binomial distribution where p is the probability of a success in a single trial & q = 1 - p is the probability of failure in a single trial is 

P(x) = nCx*p^x*q^n-x 

For this problem, what you have to do is to find 
x*P(x) for all values of x from 0 to 15, using 
p = 0.3 & q = 4/5 , i.e 

0*P(0) + 1*P(1)+...15*P(15) = 

0*15C0*(0.3)^0*(4/5)^15 + 1*15C1*(0.3)^1*(4/5)^14 + 

15*15C15*(o.3)^15*(4/5)^0