Video: Using Probability Scale to Describe the Probability of an Event

If this spinner is spun, which of the following describes the probability that the pointer lands on blue? [A] unlikely [B] certain [C] impossible [D] equally likely for it to happen or not happen [E] likely.

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Video Transcript

If this spinner is spun, which of the following describes the probability that the pointer lands on blue, A) unlikely, B) certain, C) impossible, D) equally likely for it to happen or not happen. or E) likely?

Why don’t we start by finding the probability of blue, the chances that it will land on blue. First, let’s add up all the possible outcomes. There are 10 possible outcomes. And five of those outcomes are blue. So we say the chances of the arrow falling on blue are five out of 10.

But not only do we want to know the probability of blue, we also wanna find out the chances that it’s not blue. We already know there are 10 spots for this spinner to fall. And five of them are not blue. So the chances that the spinner does not fall on blue are five out of 10.

The probability that the spinner lands on blue is the same as the probability of it not landing on blue. Another way to say that is D, that it’s equally likely for it to happen or not happen.

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