Question

In a school, 60% of pupils have access to the internet at home. A group of 8 students is chosen at random. Find the probability that No students have access to the internet

Answer 1

We do not know the total number of pupils, so you cannot answer this question then.
With 1000 pupil, from 600 pupil at 60 percent rate, we choose 8 student from 600 student.
Lets take 10 pupil rather.
The ways to eliminate 4 people as the option is the same as ways for option of 4 people.

Order not important in this however.
10*9*8*7/24=90*56/24=5040/24 equals 225

Answer 2

Answer:

In a school, 60% of pupils have access to the internet at home. A group of 8 students is chosen at random. Find the probability that exactly 5 have access to the internet.

If a pupil is selected at random and asked if he/she has an internet connection at home, the answer would be yes or no and therefore it is a binomial experiment. The probability of the student answering yes is 60% = 0.6. Let X be the number of students answering yes when 8 students are selected at random and asked the same question. The probability that X = 5 is given by the binomial probability formula as follows:

P(X = 5) = 8C5 (0.6)5 (1-0.6)3 = 0.278691