Interactive practice questions
Consider the following.
Select the option which shows two distributions with the same expectation.
Consider the graphs of the two distributions below.
Which of the following scenarios could be modelled by these two distributions?
The length of two species of fish A and B which have the same average length, but where the length in of species B varies more than in the other.
The battery life of two different brands of phones A and B, where phone A has a longer average battery life but the variation in battery life among the two phones is the same.
Consider the following.
Consider the probability density function $p\left(x\right)=\frac{1}{40}$p(x)=140 when $10\le x\le50$10≤x≤50.
Consider the probability density function $p\left(x\right)=\frac{3}{160}\left(x^2+4x\right)$p(x)=3160(x2+4x) when $0\le x\le4$0≤x≤4.