### All GRE Subject Test: Math Resources

## Example Questions

### Example Question #101 : Probability & Statistics

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

**Possible Answers:**

**Correct answer:**

Explanation:

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.

### All GRE Subject Test: Math Resources

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