In a community, it is known that 10% of households contributed to the sports complex renovation. Suppose that 150 households are selected at random. Use normal approximation to binomial distribution to solve the following probabilities:
a. What is the probability that exactly 20 households contributed to the sports complex renovation?
b. What is the probability that 16 to 18 households contributed to the sports complex renovation?
c. What is the probability that fewer than 15 contributed to the sports complex renovation?
d. What is the probability that more than 10 contributed to the sports complex renovation?
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