Area under ALL probability distribution curves is 1.0, because all possible outcomes are taken into account.
12.5 is bigger.
Because if we convert the fraction of 3/20 to normal numbers is equal to 0.15. <span>and</span> 12.5 is way bigger than 0.15 :3
Hope it helped.
<span>B. The sample might not be representative of the population because it only includes students who are attending an after-school activity.</span>
