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- anonymous

You have a 5-question multiple-choice test. Each question has four choices. You don’t know any of the answers. What is the experimental probability that you will guess exactly three out of five questions correctly? Type your answer below using complete sentences.

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- anonymous

- katieb

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- Sepeario

If the experimental probability equals the number of your specific events divided by the total events, then all we have to do is work them out.

- Sepeario

What is the sum of all the possibilities combined?

- anonymous

I don't understand the question at all

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- Sepeario

Experimental probability is the ratio of the number of times an event occurs to the total number of trials or times the activity is performed.

- Sepeario

So it's asking for you to find the probability that you will get 3 out of the 5 total questions in the test right, where there are 4 different choices for each.

- anonymous

so would you use 20 since each question has 4 choices?

- Sepeario

Yes nice.

- Sepeario

Let's think of it this way. If the probability of getting the question right is 1/4, and the probability of getting it wrong is 3/4, then essentially you will find your final result to be 1/4 * 1/4 * 1/4 *3/4 *3/4

- Sepeario

As you need 3 right.. So there's your answer.

- Sepeario

What does 1/4 * 1/4 * 1/4 *3/4 *3/4 equal?

- anonymous

.0087890625

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