SOLUTION: I need help on how to do this binomial probability problem on a TI-84 calculator: use the fact that approximately 2% of people have blood type B-. consider a random sample of 850 s

The complement event is that 12 or fewer of the 850 have blood type B-,
so we must find that and subtract it from 1.

On your TI-84:

Press ON
Press CLEAR

Type this--->   1-

Press 2nd
Press VARS
Press ALPHA
Press APPS

You should see this--->   1-binomcdf(
Type this--->   850,.02,12)

[The comma key is just above the 7 between the x² key and the "(" key]

You should see this--->   1-binomcdf(850,.
                          02,12)

Press ENTER

You should see this--->   1-binomcdf(850,.
                          02,12)
                               .8675104464

That's the answer, .8675104464

Edwin