Question

A game of chance consists of spinning an arrow which is equally likely to come to rest, pointing to one of the numbers 1, 2, 3, …, 12. What is the probability that it will point to a prime number

Answer 1

Answer:

no.of all possible outcomes= 12

let p(E) denotes the event of getting a prime number

no.of all favourable outcomes=5

p(E)=no.of all favourable outcomes÷ no.of all possible outcomes= 5÷12

Answer 2

Answer:

Ans. Out of 8 numbers, an arrow can point any of the numbers in 8 ways.

Total number of favourable outcomes = 8

(i) Favourable number of outcomes = 1

Hence, P (arrow points at 8) =

(ii) Favourable number of outcomes = 4

Hence, P (arrow points at an odd number) =

(iii) Favourable number of outcomes = 6

Hence, P (arrow points at a number > 2) =

(iv) Favourable number of outcomes = 8

Hence, P (arrow points at a number < 9) = =1