GRE Subject Test: Math : Binomial Distribution

Study concepts, example questions & explanations for GRE Subject Test: Math

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Example Questions

Example Question #1 : Binomial Distribution

A fair coin is tossed 15 times. What is the probability of observing less than 3 heads?

Possible Answers:

Correct answer:


This problem uses the Binomial Distribution: 

For this problem n is the number of trials, or 15. Because the problem stated that the coin was a fair coin the probability of heads is one half, or .5.

The binomial distribution is a discrete distribution so the expression x<3 has to be broken down.

Adding the probabilities will give the final answer.

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