Question

A box contains 1919 large marbles and 1111 small marbles. Each marble is either green or white. 66 of the large marbles are green, and 55 of the small marbles are white. If a marble is randomly selected from the box, what is the probability that it is large or white? Express your answer as a fraction or a decimal number rounded to four decimal places.

Answer 1

0.8 probability that it is large or white.

Explanation:

A probability is the number of desired outcomes divided by the number of total outcomes.

In this question:

We have 19 + 11 = 30 marbles, which means that 30 is the number of total outcomes.

We have 19 large marbles, and 5 small marbles which are white, which means that the number of desired outcomes is 19 + 5 = 24. So

`p = (D)/(T) = (24)/(30) = 0.8`

0.8 probability that it is large or white.