Question

A tyre manufacturing company kept a record of the distance covered before a tyre needed to be replaced. The table shows the results of $1000$ cases. If a tyre is bought from this company, what is the probability that : it has to be substituted before $4000km$ is covered?

Distance(in km)	Less than $4000$	$4000to9000$	$9001to14000$	More than $14000$
Frequency	$20$	$210$	$325$	$445$

Answer 1

Total number of trials $=1000$

The frequency of a tyre required to be replaced before covering $4000km=20$

$$\begin{gathered} P\left(E_1\right)=\frac{20}{1000} \\ =0.02 \end{gathered}$$

Hence, the required probability for given condition is $0.02$