What is the value of k for the showroom's…

What is the value of k for the showroom's daily sales?

Question 18

EasyOriginal question

A car showroom sells $X$ cars a day, where $X$ takes the values 0, 1, 2, 3 and 4 with probabilities $k$ , $2k$ , $3k$ , $2k$ and $2k$ .

What is the value of $k$ for the showroom's daily sales?

0.05

Correct answerYour answer

0.1

Correct answerYour answer

0.125

Correct answerYour answer

0.2

Correct answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer B

Correct answer: B

Worth noting

0.2 is $P(X = 1) = 2k$ , not $k$ itself.

Ten questions from Random Variables, Expectation & Variance, at your own pace.

Ten questions from Random Variables, Expectation & Variance, at your own pace.