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Binomial & Poisson Distributions · Question 29 of 68

Question 29

EasyOriginal question

A fair die is thrown 30 times. What is the expected number of sixes?

1

Correct answerYour answer

\frac{25}{6}

Correct answerYour answer

5

Correct answerYour answer

6

Correct answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer C

Correct answer: C

The number of sixes is binomial with $n = 30$ , $p = \frac{1}{6}$ .
Mean $= np = 5$ .

Worth noting

$\frac{25}{6}$ is the variance, $npq$ .

Concept: The mean of a binomial distribution
Typical timeTypical: 60 s
Your timeYours: —

The rule this testsMean and variance of a binomial distribution

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