SOLUTION: Studies have shown a particular television commercial is understood by 25% of first grade students and 80% of fourth grade students. If a television advertising agency randomly sel

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Question 512815: Studies have shown a particular television commercial is understood by 25% of first grade students and 80% of fourth grade students. If a television advertising agency randomly selects one first grader and one fourth grader, what is the probability neither child would understand the commercial, assuming the children's reactions are independent?
Answer by stanbon(75887) About Me  (Show Source):
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Studies have shown a particular television commercial is understood by 25% of first grade students and 80% of fourth grade students. If a television advertising agency randomly selects one first grader and one fourth grader, what is the probability neither child would understand the commercial, assuming the children's reactions are independent?
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1st grade don't understand: 0.75
4th grade don't understand: 0.20
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P(both 1st and 4th don't understand): 0.75*0.20 = 15%
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Cheers,
Stan H.
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