Question 668436
a study indicates that 4% of american teenagers have tattoos. if you randomly sample 30 teenagers what is the probability at most 3 teenagers will have tattoos?
<pre>
On your TI-84

Press 2ND VARS ALPHA APPS

You'll see this:

          binomcdf
trials:
p:
x value:
Paste

Make that screen read:

          binomcdf
trials:30
p:.04
x value:3
Paste

Scroll down to Paste
Press ENTER 

You'll see this:

binomcdf(30,.04,
3)

Press ENTER again

You'll see

     .9694071153

That's the answer.  

[Note: If you have an old version of TI-84, you have to
make it read:  binomcdf(30,.04,3)  then press ENTER]



Edwin</pre>