anonymous
  • anonymous
One card is selected from a deck of cards. Find the probability of selecting a black card or a card less than 8. I did it this way: P(B or <8) = P(B) + P(<8) - P(B and <8) = (13/52) + (28/52) - (7/52) = 34/52 = 17/26 The homework key says it's 10/13? What am I doing wrong?
Statistics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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retirEEd
  • retirEEd
Is an ACE the highest card or the lowest card?
anonymous
  • anonymous
lowest
retirEEd
  • retirEEd
Thanks I will start working on this with you but I'm not the best with probabilities.

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More answers

welshfella
  • welshfella
P(black) = 1/2 P( <8) = 28/52 = 7/13
welshfella
  • welshfella
Probability isnt my forte either
anonymous
  • anonymous
OK, duh! I was thinking of spades. So, that gives me P(B or <8) = P(B) + P(<8) - P(B and <8) = (26/52) + (28/52) - (7/52) = 47/52 Which is still different than the key.
retirEEd
  • retirEEd
I got 7/13 also. but I'm not sure. I am fairly confident it isn't 10/13.
anonymous
  • anonymous
Oh crap, I was counting spades again. He's the solution. P(B or <8) = P(B) + P(<8) - P(B and <8) = (26/52) + (28/52) - (14/52) = 40/52 = 10/13
welshfella
  • welshfella
how did you get 14/52?
anonymous
  • anonymous
There are 7 spades less than 8 (A, 1,2,3,4,5, 6,7) and 7 clubs. That's 14 cards less than 8.
welshfella
  • welshfella
AH I see!
anonymous
  • anonymous
weshfella, your 1/2 above helped me figure out I was miscounting. Thanks!
welshfella
  • welshfella
yw
welshfella
  • welshfella
for some reason I was thinking = 8 rather than < 8 !!!!

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