Question

There are 10 marbles in a box with number 2 to 11 marked on each of them. Find :
(a) the probability of drawing a marble with number 5 on it. (b) the probability of drawing a marble with prime number on it.

Answer 1

Step-by-step explanation:

Sample space = { 2,3,4,5,6,7,8,9,10,11}

n(s)= 10

Let event A be that a marble draw is a 5

A = { 5 }

n(s) = 1

p(A)= n(A)

n(S). = 1

10

Let event B be that marble draw is a prime number

B={ 2,3,5,7,11}

n(B) =5

p(B) = 5

10. = 1

2