Question

There are 5 red marbles, 8 blue marbles, and 12 green marbles in a bag.

What is the theoretical probability of randomly drawing either a red marble or a blue marble?

20%
32%
13%
52%

Answer 1

52%

Explanation:

The total number of marbles in the bag is

5+8+12 = 25

P(red or blue) = (red+blue) / total

= (5+8)/25

=13/25

=.52

= 52%

Answer 2

The probability of drawing a marble will be either red or blue is 52%

Explanation:

Given,

Number of red marbles = 5

Number of blue marbles = 8

Number of green marbles = 12

Total number of balls = 25

To find the probability( either a red or blue marble)

Formula

Probability( either a red or blue marble) = P( red) + P(blue)

=
`(5)/(25) +(8)/(25)`

=
`(13)/(25)`

Hence, the probability is =
`(13)/(25)`×100 = 52%