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Random Variables, Expectation & Variance · Question 8 of 68

How many different values can the number of tails X take?

Question 8

EasyOriginal question

Four fair coins are tossed together, and XX is the number of tails that show.

How many different values can the number of tails XX take?

Options for question 8

Show the answer and explanation
CorrectNot quiteAnswer D

Correct answer: D

Explanation

  1. There can be 0, 1, 2, 3 or 4 tails.

  2. That is 5 values.

Worth noting

16 counts the outcomes, such as HTHT; many outcomes give the same value of XX.

Concept
The values of a random variable
Typical time
90 s
Your time
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The rule this testsRandom variables
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Ten questions from Random Variables, Expectation & Variance, at your own pace.

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