It has been reported that 70% of university students do volunteer work during their summer vacation. Four students are randomly selected to do volunteer work.
a. The probability that at least 1 student will do volunteer work this summer (correct to 3 decimal places) is
b. The probability that exactly 3 graduates will not do any volunteer work this summer (correct to 4 decimal places) is
c. The expected number of students (correct to 1 decimal place) who will not do volunteer work this summer is
Let the number of students who do volunteer work during their summer vacation:
Given
a.
b.
c.
Comments