In a small class of 5 students there is a probability of 080

In a small class of 5 students, there is a probability of 0.80 that a student will ask a question at the start of class. Assuming that students decide to ask a question independently of each other, what\'s the probability that there will be at least one question at the start of class?

Solution

answer = 1 - (0.8)^5

0.80-for each--p----------

0.20--------------q

independently of each other

(p+q)^5=p+q)^5 = p^5 + 5p^4 * q + 10p^3 * q^2 + 10p^2 * q^3 + 5p *q^4 + q^5.

what\'s the probability that there will be at least one question at the start of class?

1 - (0.8)^5