Question

A tyre manufacturing company kept a long record of the distance covered before a tyre needed to be replaced. The table shows the results of 1000 cases.

Distance (in km) No. of cases

less than 4000 20
4000 to 9000 210
9001 to 14000 325
more than 40000 445

If you buy a tyre of this company, what is the probability that :
i) it will need to be replaced before covering 4000 km ?
ii) it will last more than 9000 km?
iii) it will need to be replaced after covering between 4000 km and 14000 km?

Answer 1

Answer:

i) 2/100= 0.02

ii) 77/100= 0.77

iii) 535/1000= 0.535