Question

In any 15-minute period in a statistics class, the probability of observing at least one mistake made by professor Doe is 5%. What is the probability of observing at least one mistake made by this professor in this 60-minute long class

Answer 1

Hey there!

We can set this up a proportion to figure out the percent we need.

$\frac{mins}{percent} = \frac{15}{5} =\frac{60}{p}$

If you can see, the second numerator is four times the first. So, we multiply the bottom by four and we get 20.

Therefore, the probability if observing at least one mistake made by this professor is 20%.

I hope this helps!