Does a triangle have to have 2 of the same sides
2 answers:
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According to the distribution, we have teenagers who have fewer than 3 pairs of shoes in their closets.
The total number of teenagers surveyed are 100 (add all frequencies).
Hence the required probability is:
$ \frac{12+20}{100}=\frac{32}{100}=0.32$
Alternatively, add the respective probabilities like so:
$P_{fewer \: than \: 3}=0.12+0.20=0.32$