A student guesses every question of an 8-question test, each with 5 options of which one is right. A success is a correct answer. What are $n$ and $p$ ?

n = 5,\ p = \frac{1}{8}

Correct answerYour answer

n = 8,\ p = \frac{4}{5}

Correct answerYour answer

n = 8,\ p = \frac{1}{5}

Correct answerYour answer

n = 40,\ p = \frac{1}{5}

Correct answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer C

Correct answer: C

Worth noting

$\frac{4}{5}$ is $q$ , the chance of a wrong guess.

Ten questions from Binomial & Poisson Distributions, at your own pace.

Ten questions from Binomial & Poisson Distributions, at your own pace.

A student guesses every question of an 8-question test, each with 5 options of which one is right. A success is a correct answer. What are nnn and ppp?