kluevehe Posted May 4, 2008 Share Posted May 4, 2008 In a five day period the chance of rain each day is 50% what is the chance that it will rain (a) only twice (b) at least 3 times? oa: a) 5/16 b) 1/2 Quote Link to comment Share on other sites More sharing options...
krovvidy Posted May 4, 2008 Share Posted May 4, 2008 a) Choose 2 days out of 5 ... 5c2 * (1/2)^5 = 5/16 b) Choose 3 out 5 + Choose 4 out 5 + Choose 5 out 5 days ... 5c3 * (1/2)^5 + 5c4 * (1/2)^5 + 5c5 * (1/2)^5 i.e., 16/32 = 1/2 Quote Link to comment Share on other sites More sharing options...
bose Posted May 5, 2008 Share Posted May 5, 2008 1)5c2(0.5)^5=5/16 2)(5c3+5c4+5c5)(0.5)^5=1/2 Quote Link to comment Share on other sites More sharing options...
tarkumar Posted May 5, 2008 Share Posted May 5, 2008 Agree with krovvidy and bose Quote Link to comment Share on other sites More sharing options...
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