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OpenStudy (anonymous):
a stack of 20 card is numbered 1 through 20 one cards is randomly selected what is the probability that the number is less than 8
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OpenStudy (anonymous):
you need to count how many cards work all numbers less than 8 .... there are 8 numbers, so for your experiment there work 8 cards. 8/20=2/5. the probability of drawing a card with number less than 8 is 2/5
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