Question

A)
The theoretical probability of a simple event is P(event) =
EXAMPLE: A jar contains 10 green, 7 red, and 3 blue marbles. What is the probability of randomly picking a red marble?
P(red) =
The probability of randomly picking a red marble is

Use the spinner below to complete the problem.
number of favorable outcomes
total number of outcomes in a sample space
= =
number of red marbles
total number of marbles in the sample space
7
10+7+3
7
20

Answer 1

A) The theoretical probability of a simple event is
P(event) = (number of favorable outcomes) / (total number of outcomes in the sample space).

Example: 10 green, 7 red, 3 blue marbles.
P(red) = (number of red marbles) / (total number of marbles)
= 7 / (10 + 7 + 3)
= 7 / 20 = 0.35 = 35%.

So the probability of randomly picking a red marble is 7/20 (35%).