<PRE><B>Question 369109</B>
This is a good example of using the Binomial Probability Distribution, because for each member of the sample, there can only be two outcomes. &lt;br&gt;

In other words, for each person, they will either have undesirable side effects, or they will not!&lt;br&gt;

The expected number of people who will have undesirable side effects is given by:&lt;br&gt;

mean (or the expected value)=n*p&lt;br&gt;

where n is the sample size and p is the theoretical underlying probability&lt;br&gt;

so, we have&lt;br&gt;

mean=100*(1/20)&lt;br&gt;

mean=5&lt;br&gt;

&lt;b&gt;So, we can expect to see 5 people out of 100 who take this drug to have undesirable side effects.&lt;/b&gt;&lt;br&gt;

I hope this helps!&lt;br&gt;</PRE>