Question 1200895
<pre>
Your teacher might expect you to use a TI-84 calculator.

It's the probability of getting 30-21=9 or fewer wrong with the probability of
getting a question wrong being 1-0.35=0.65.

press 2nd vars
scroll down to B:binomcdf(
press enter
beside trials: type 30
beside p: type 0.65
beside x value: type 9
press the down arrow to highlight Paste
press enter
you should read binomcdf(30,0.65,9)
press enter
Read 1.001487905E-4

The E-4 means x10<sup>-4</sup> (the E is for the exponent of 10)

1.001487905x10<sup>-4</sup>

which is scientific notation and means to move the decimal point left
4 places.

0.0001001487905

Edwin</pre>