All GRE Subject Test: Math Resources
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:
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.
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All GRE Subject Test: Math Resources
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