Question

the probability of selecting a blue marble at random from a jar that contains only blue, black green marble is 1.5 the probability of selecting a black marble at random from the same jar is 1.5 if the jar contain 11 green marble find the total number of marble in the jar

Answer 1

The direct answer is 20

Answer 2

Answer:

The total number of marble in the jar is 19

Step-by-step explanation:

Given the probability of selecting blue marble = 1/5 = 0.2

the probability of selecting black marble = 1/5 = 0.2

Hence probability of selecting green marble = 1 - (0.2 + 0.2) = 0.6

Number of green marble = 11

Let the total number of marble = x

=> 11/x = 0.6

=> x = 11/0.6 = 18.33 = 19

Hence the total number of marble in the jar is 19