40% of the population has A blood.3

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