Examples of Probability Problems


In this lesson we will learn how to solve probability problems involving a spinner.

You can also learn how to solve a probability word problem about marbles by clicking on this link. A probability measures the likelihood of a certain event. It always ranges between 0 and 1. The following formula can be used to find the probability of a particular event:

P(event) = the number of favorable outcomes / the total number of outcomes

As you can see probabilties are fractions, but they can also be expressed as decimals or percents.

In the following video we will learn how to solve several problems involving a spinner:



Let's solve another problem:

If there are 6 apples, 3 oranges, and 1 plum in a basket, what is the probability of choosing an apple without looking in the basket?

Solution:

P(choosing an apple)= 6/10 = 3/5 = 0.6 = 60%

The numerator is 6 because there are six apples in the basket, therefore six favorable outcomes. The denominator 10 because there are 10 fruits in the basket (the total number of outcomes).


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