50% of all marriages eventually end up in divorce during the first 5 years of marriage. In a random sample of 36 newly-weds from five years ago, the probability that there are at least 20 couples still living together (after 5 years of marriage) is:

Question

anonymous · Answer

Need to use the cumulative binomial distribution function with
n = 36, r = 30 p=q=0.5

summersnow8 · Answer

sorry, it is suppose to be 20 couples so would it be: 

binomial cdf ( 36, .50, 20) ?

anonymous · Answer

Yes. Did I misread 20 as 30? sorry.