# In a survey, several people were asked how

Makanja Mwinyi 2022-07-22

In a survey, several people were asked how many years it has been since they purchased a mattress. The results are shown in the table.

Evaluate the following (Express the answer in 2 decimal places):

a) Standard deviation (4 Marks)

b) Coefficient of variation (1 Mark)

c) Expected value of x$x$, that is E(x)$E\left(x\right)$ (2 Marks)

d) Variance of x$x$, that is Var(x)$Var\left(x\right)$ (3 Marks)

e) The probability of having bought a mattress in the last 3 years. (1 M

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