About 1/5 of all adults in the united states have type o+ blood. if three randomly selected adults donate blood, find the probability of each of the following events . (round your answer to four decimal points)
a) all three are type o+
b) none of them are type o+
c) two out of three are type o+

EXPLANATION:

First you must find out what the initial payment would have been, My way of doing it was simply multiplying 37 by 11.5
I then get 425.5, then to find out the amount for the .5 (half hour)simply divide 11.5,the answer is then £5.75,now we add £425.5 + £5.75= £431.25
Now... we need to deduct her “deductions” lol which was £116.30 so
£431.25-£116.30=£314.95
So her payment was £314.95

Really hoped that helped have a wonderful day