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# M 302 - #27-29 due next wed Don't read the book Ex8 pg 748...

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#27-29 due next wed Don’t read the book! Ex8 pg 748 Draw 3 balls Without replacement (means we do not replace the 1 st object before the next activity) Colors are distinguishable, use slots!! Total number of outcomes = 11 * 10 * 9 1 st ball 2 nd ball 3 rd ball = 990 Number of favorable outcomes = 4 * 5 * 2 1 st ball red 2 nd ball yellow 3 rd ball blue = 40 P(she draws red, yellow, blue in that order) = 40 fav / 990 total = 4/99 ex25 pg 753 Draw 2 cards without replacement. Total number of outcomes = 52 * 51 1 st card 2 nd card Number of favorable outcomes = number of ways to draw 2 face cards = 12 * 11 1 st 2 nd P (drawing 2 face cards) = 12*11 / 52*11 = 11/221 Pr 37 pg 753 P (1 st 2 sales are for more than \$100) = .80 * .80

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st customer 2 nd customer = .640 pg 753 #39 P(none of the 1 st 3 sales are more than \$100) = .20 * .20 * .20 1 st 2 nd 3 rd customer = .008 #47 pg 754 4 men 3 women – 7 people Number of the interviews matters! Use slots! Total number of outcomes = 7 * 6 * 5 * 4 * 3 * 2 * 1 1 st 2 nd 3 rd 4 th 5 th 6 th 7 th = 5040 Number of favorable outcomes = number of ways to have a women interviewed 1 st = 3 * 6 * 5 * 4 * 3 * 2 * 1 = 2160 Women 1 st person is a woman 2160 / 5040 = 3/7 pg755 #63 P(rain on 2 consecutive days in Nov) = .500 * .800 1 st day 2 nd day we know nothing about the prior day rain rain = .400 Conditional probability –means that we are required to meet a stated condition about the problem. Everything that does not meet the condition is left out of the problem completely! * “Given” always is present! Pg 753 #24
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M 302 - #27-29 due next wed Don't read the book Ex8 pg 748...

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