Math CentralQuandaries & Queries


Question from Malonda, a student:

Suppose you select a 3-digit number at random from the set of all positive 3-digit numbers. Find each probability.
P(odd numbers)


Probabilities are expressed as decimals between 0 and 1. So the probability P(heads) when flipping a coin is 0.5. The probability P(leapyear) of being born in a leap year is 0.25.

If you randomly select a three digit positive number, what is the probability it is an odd number? That's P(odd). Don't get thrown off by the fact it is a three digit number, the probability would be the same for any number of digits!

Stephen La Rocque.

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