statistics

Joe dealt 20 cards from a standard 52-card deck, and the number of red cards exceeded the number of black cards by 8. He reshuffled the cards and dealt 30 cards. This time, the number of red cards exceeded the number of black cards by 10. Determine which deal is closer to the 50/50 ratio of red/black expected of fairly dealt hands from a fair deck and why.
A. The first series is closer because 1/10 is farther from 1/2 than is 1/8.
B. The series closer to the theoretical 50/50 cannot be determined unless the number of red and black cards for each deal is given.
C. The second series is closer because 20/30 is closer to 1/2 than is 14/20.
D. The first series is closer because the difference between red and black is smaller than the difference in the second series.

HELP!!!!

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asked by phia
  1. 2x + 8 = 20

    2x = 12

    x = 6

    red/black = 14/6

    Repeat for second deal.

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    posted by PsyDAG
  2. I came up with choice A. Is that right?

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    posted by phia
  3. Are you really looking for the "ratio of red/black"?

    Since the red cards are greater than the black cards, you have a ratio of red to black > 1. If it is black to read, then 6/14 = 3/7

    I would disagree.

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    posted by PsyDAG

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