MATH

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Of all the videotapes in a large shipment, 21% have a defective tape, 16% have a defective case, and 11% have both defects. If you purchase one of the videotapes in this shipment, find the probability that it has the following.
(a) A defective tape or a defective case.
p = .26

(b) A good tape or a good case.
p = ?

(c) A good tape and a good case.
p = .74

  • MATH -

    Out of 100
    10 have only broken tape
    5 have only broken case
    11 have both broken
    so
    26 have something broken
    74 are whole
    100 - 11 = 89 have a good case or a good tape (or both)

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