Question
Use the pie chart, which shows how U.S. adults rate their financial shape. (Source: Pew Research Center).You choose 4 people at random from a group of $1200 .$ What is the probability that all four would rate their financial shape as excellent? (Make the assumption that the 1200 people are represented by the pie chart.)
Step 1
Since the order of selection does not matter, we use the combination formula. The combination of selecting 4 out of 1200 is denoted as $C(1200, 4)$, which is calculated as $\frac{1200!}{4!(1200-4)!}$, resulting in $85,696,865,970$ ways. Show more…
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