Question

Suppose students are independent from one another. 63% of students are using Mr. Martin's new social media app, Mar-tin-stagram. 2 students are randomly selected. What is the probability that both of them use it?

Answer 1

Probability that both of them use it = 0.3945

Explanation:

Given:

Student use app = 63%

Number of chosen student = 2

Computation:

Assume total number of student = 100%

So, probability that both of them use it.

⁶³C₂ / ¹⁰⁰C₂

`((63!)/(2! 61!) )/((100!)/(2! 98! ) ) \\\\(63* 62)/(100 * 99) \\\\(3,906)/(9,900) \\\\0.3945`

Therefore, probability that both of them use it = 0.3945