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A dice is rolled 6 times. Find the probability of rolling no more than 2 ones (round four decimal places) 

 Jul 13, 2016
 #1
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No more than  two "1s"  means no "1s", one 1  or two "1s"

 

No "1s"   =  (5/6)^6   = about  .33489

 

One 1   =  C(6,1)(1/6)(5/6)^5  = abouy .40187

 

Two "1s"  = C(6,2) (1/6)^2(5/6)^4  = about .2009

 

So....the probability of rolling no more than 2 "1s"   =  .33489 + .40187 + .2009  = about .93766  or .9377 (rounded)

 

 

 

cool cool cool

 Jul 14, 2016

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