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October 20, 2014

October 20, 2014

Posted by **helpme** on Saturday, November 1, 2008 at 6:13pm.

3 coins are flipped , find the following probabilities:

a) P(2 heads)

b) P( at most 2 heads)

c) P(no heads)

i got

a) 1/4

b) .75

c) 5/8

- math -
**drwls**, Saturday, November 1, 2008 at 7:25pmThere are 8 possible outcomes

HHH TTT

HHT TTH

HTT THH

HTH THT

a) wrong 3 out of 8 have two heads

b) wrong. "At most two" is the same as "not three heads" 7 out of 8 don't have three heads.

c) wrong again "no heads" is the same as "all tails"

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