Hello I have trouble with this problem I have a TI 83 plus. I know you have to use binomial but not sure if it is cdf or pdf or how to plug in the numbers.
binomcdf(N,p,x) gives the probability of x OR FEWER successes
binompdf(N,p,x) gives the probability of EXACTLY x successes.
1) According to government data, the probability that a woman between the ages of 25 and 29 was never married is 40%. In a random survey of 10 women in this age group, what is the probability that at least eight were married?
That's the same as the probability that 2 or fewer of the 10 were never married.
We will call the selection of an unmarried woman a "success".
So the binomial probability of x=2 or fewer successes in n=10 trials, where
the probability of 1 success in 1 trial is p=.4
Press ON
Press CLEAR
Press 2nd
Press VARS
Scroll to highlight binomcdf(
Press ENTER
After binomcdf( type this: 10,.4,2) , so that you see:
binomcdf(10,.4,2)
Press ENTER
See this .1672897536
That rounds off to choice a).
Edwin