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22 October, 07:57

The principal of a high school needs to plan seating for commencement. The following two-way table displays data for the students who are involved in this year's commencement ceremony.

Grade level In choir Not in choir TOTAL

Junior 15 3 18

Senior 23 436 459

Other 3 0 3

TOTAL 41 439 480

For these students, are the events "senior" and "not in choir" mutually exclusive?

Find the probability that a randomly selected student from this group is a senior OR is not in choir.

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Answers (1)
  1. 22 October, 08:02
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    Answer: 77/80 = 0.9625
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