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40% of the population has type A blood. a) If 8 people are selected at random,...

40% of the population has type A blood.
a) If 8 people are selected at random, what is the probability that four or less of them have type A blood?
b) If 80 donors come to give blood one day, what is the probability that 40 or less of them have Type A blood (using the normal approximation)? Explain why this is higher or lower than the answer in part (a).
c) If 10 people give blood one day, what is the probability that more than 5 of them are Type A?
d) If 100 people come to give blood, what is the probability that more than 50 the donors is of Type A? Explain why this answer is higher or lower than the answer in part (c).

Math   Statistics-And-Probability   
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