Question 1069931
<pre>
On your TI-84 calculator, that's 1 minus
the cumulative probability that 21 or fewer
smoke.  Press these keys in this order after
clearing your calculator, assuming yours
is a later model TI-84

1
-
2ND 
VARS 
ALPHA 
APPS 
42
ENTER
.35
ENTER
21
ENTER
ENTER

0.0154905288   <-- answer

If yours is an older TI-84,

1
-
2ND
VARS
scroll to binomcdf(
ENTER

make screen read:

1-binomcdf(42,.3
5,21)

ENTER

Edwin</pre>