It has been found that 65% of women over 50 years old suffers from osteoporosis. 8 women were randomly chosen from a group of women over 50 years old.
(a)Find the probability that out of these 8 women, more than 6 of them suffered from osteoporosis. Ans:0.1691
20% of women suffering from osteoporosis recovers after 2 years. If 3 women of age above 50 years old were randomly chosen,
(b)find the probability that none of them suffer from osteoporosis. Ans:0.1106
I managed to solve (a) only. How do you solve (b)?
Thanks for your help.