SOLUTION: 69% of men consider themselves baseball fans. If you randomly select 10 men and ask each if he considers himself a pro ball fan find the probability that the number who consider th

Question 1036243: 69% of men consider themselves baseball fans. If you randomly select 10 men and ask each if he considers himself a pro ball fan find the probability that the number who consider themselves fans is exactly 5, at least 6, and less than 4
Answer by Edwin McCravy(20056) (Show Source): You can put this solution on YOUR website!
69% of men consider themselves baseball fans. If you
randomly select 10 men and ask each if he considers
himself a pro ball fan find the probability that the
number who consider themselves fans is exactly 5,

On your TI-83 or 84,

Press 2ND VARS 

Scroll down to binompdf(   [not binomcdf( ]

and press ENTER

It's 10 trials, with p=0.69, the probability of selecting 
1 fan in 1 trial, with the x value of 5.

binompdf(10,0.69,5)

press ENTER, read

0.1128377619

at least 6,

Here we have to find the probability of the complement event
and subtract it from 1.  That's the probability of 5 or fewer,
so 

On your TI-83 or 84,

Press 2ND VARS 

This time, scroll down to binomcdf(   [not binompdf( ]

and press ENTER

It's 10 trials, with p=0.69, the probability of selecting 
1 fan in 1 trial, with the x value of 5.

binomcdf(10,0.69,5)

press ENTER, read

0.1679474597

Subtract from 1,

0.8320525403

and less than 4

That must be interpreted as "3 or less"

On your TI-83 or 84,

Press 2ND VARS 

Scroll down to binomcdf(   [not binompdf( ]

and press ENTER

It's 10 trials, with p=0.69, the probability of selecting 
1 fan in 1 trial, with the x value of 3.

binomcdf(10,0.69,3)

press ENTER, read

0.01286367757

Edwin

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