Lia K.

asked • 04/21/21

A number is chosen randomly from the numbers 1-20. If event A = {a multiple of 5}, what is the value of P(A')?

  1. A number is chosen randomly from the numbers 1-20. If event A = {a multiple of 5}, what is the value of P(A')?

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Jon S. answered • 04/21/21

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How many numbers between 1 and 20 are a multiple of 5? Divide that number by 20 to get P(A). P(A') = 1 - P(A).

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Lia K.

would it be 17/20? I did: Multiples of 5 between 1-20 (5,10,15) 3 numbers, 3/20, P(A) + P(A') = 1 P(A') = 1 - P(A) = 1 - 3/20 = 17/20
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04/21/21

Lia K.

The answer says its 4/5 but I don't understand why I didn't get that.
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04/21/21

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