Mathematics

Problem

Length	Frequency
0 - 19	17
20 - 39	38
40 - 59	19
60+	4

Jose surveyed the length of TV commercials (in seconds). Find, to 3 decimal places, the experimental probability that the next TV commercial will last: a. 20 to 39 seconds b. at least one minute c. between 20 and 59 seconds (inclusive).

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