Consider a randomly selected group of 100 students

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Consider a randomly selected group of 100 students. Suppose 40 students are majoring in biology or chemistry. Suppose 15 students major chemistry. Assume that 5 students are majoring both biology and chemistry. If a student is selected randomly,

1. a) what is the probability that the student is from other majors?
2. b) what is the probability that the selected student majors only in chemistry?
3. c) what is the probability that the selected student is a biology major?
4. d) If the sleeted student is not a chemistry major, what is the probability that the student is a biology major?

Consider a drive-through restaurant. The restaurant experiences, on average, 30%             

    customers use visa cards. Consider a random sample of 20 customers.

a) What is the probability that at least 5 will use visa cards?

b) What is the probability that more than 15 or less than 10 customers will use visa cards?