a card is chosen at random from a set of cards numberedfrom 1 to 20. Find the probability of a choosing a cards that is.

a)an even number b) a number conaining a 5

c)a two- digit number d) a number less than six

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You can answer all four of those questions using the same basic technique.

Probability = number of positive outcomes / total number of possible outcomes.

For example, to answer part (d), how many cards are there in the set with numbers less than six? Five of them, right? (1, 2, 3, 4, and 5). And how many cards are there total? 20. So the probability is 5/20 = 0.25 = 25%.

So what do you get for answers for part (a) through (c)?