A standard deck of 52 cards contains 13 cards each from the four suits: spades, clubs, diamonds and hearts. If two cards are randomly picked without replacement, what is the probability that they are both diamonds?

## Office Space

If 3 out of every 8 people in an office are women, what is the ratio of men to women?

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## Wrath of the Math

25x is to 40y as 25y is to what?

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## Book Organization

In how many different orders can six books be organized in a shelf?

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## Normal Distribution Percentages

In the normal distribution, what percentage of scores fall within one standard deviation of the mean?

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## I Know Kung Fu

What is the ratio of the number of composite integers to the number of prime integers in the interval [1,10]?

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## Describe the Data

Given the following data, which of the following terms best describes the data?

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## Intelligent Doodles

A friend of yours draws a circle circumscribing a regular octagon. What is the ratio of the area of the octagon to the circle?

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## Population Growth

Which of the following would be best to use for population growth with known upper limit?

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## Effectiveness of Hand Wash

Bacteria such as V. cholerae are known to follow an exponential growth curve rate, and will double their number every 15 minutes. Fortunately, anti-bacterial hand wash can kill 99.9% of bacteria on a surface. If a colony of 500 V. cholerae cells are left alone for 2 hours, then anti-bacterial handwash is applied thoroughly, how many bacterial cells are left?