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Introduction to Random Variables and Probability Distributions

AP Statistics· difficulty 2/5

X takes values 1, 2, 3 with P(1) = 0.1, P(2) = 0.3, P(3) = k.

X P(X) 1 0.1 2 0.3 3 k

What is k?

  • A

    0.6

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  • B

    0.4

  • C

    0.5

  • D

    1.0

Explanation

Probabilities sum to 1. So k = 1 - 0.1 - 0.3 = 0.6.

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