Question

Suppose we throw a die once. (i) What is the probability of getting a number greater than 4? (ii) What is the probability of getting a number less than or equal to 4?

Answer 1

(i) Here, let E be the event ‘getting a number greater than 4’. The number of possible outcomes are six : 1, 2, 3, 4, 5 and 6, and the outcomes favourable to are 5 and 6. Therefore, the number of outcomes favourable to E is 2. So,

P(E) = P (number greater than 4) = 2/6=1/3

(ii) Let F be the event ‘getting a number less than or equal to 4’.
Number of possible outcomes = 6
Outcomes favourable to the event F are 1, 2, 3, 4.
So, the number of outcomes favourable to F is 4.

Therefore, P(F) =4/6=2/3