Question

The numbers 1 to 20 are written on separate slips of paper and put in a box. Now the box is thoroughly shaken to mix the slips well. What is the probability of drawing the following numbers from the box without looking?
a) A two-digit number.
b) A number greater than 13.

Answer 1

Answer:

(A) 11/20

(B) 7/20

Step-by-step explanation:

(A) The two digit numbers between 1 to 20 are

11,12,13,14,15,16,17,18,19,20

So there are 11 like outcomes

P(E) = (number of like events) /(total number of events)

P(E) = 11/20

(B) The numbers greater than 13 in between 1 to 20 are

14,15,16,17,18,19,20

So there are 7 like outcomes

P(E) = (number of like events) /(total number of events)

P(E) = 7/20