Mathematics
Mathematics, 19.11.2019 02:31, deelashasharma

Researchers at george washington university and the national institutes of health claim that approximately 75% of people believe "tranquilizers work very well to make a person more calm and relaxed". consider the next 80 people interviewed, what is the probability that:

a. at least 50 are of this opinion?
b. at most 56 are of this opinion?

(hint: use normal approximation to binomial.)

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