Question

The probability of choosing a red marble from a box is 4/23 . What is the probability of not choosing a red marble from the box?

Answer 1

19/23

Explanation:

Since the probability of choosing a red marble is 4/23, the probability of not, is the difference between the total probability and the probability of picking a red marble.

total probability - P(red)

The total probability is 1, which is also equal to 23/23

23/23-4/23

Subtract across the numerator and leave the denominator as is.

19/23

So, the probability of not picking a red marble is 19/23

Answer 2

P (not red) = 19/23

Explanation:

The probability of getting a red marble and the probability of not getting a red marble have to equal 1 since they are opposites

P(red) + P(not red) = 1

4/23 + P(not red) = 23/23

Subtract 4/23 from each side

4/23 -4/23 + P(not red) = 23/23 - 4/23

P (not red) = 19/23