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. [CBSE 2012 (March)]
Table
|
Distance (in km) |
less than 400 |
400 to 900 |
900 to 1400 |
more than 1400 |
|
Frequency |
210 |
325 |
385 |
80 |
If you buy a tyre of this company, what is the probability that:
(i) it will need to be replaced before it has covered 400 km?
(ii) it will last more than 900 km?
(iii) it will need to be replaced after it has covered somewhere between 400 km andb 1400 km?
(iv) it will not need to be replaced at all?
(v) it will need to be replaced?
Solution
Solution not provided.
Ans. (00.21 (ii) 0.465 (iii) 0.71 (iv) 0 (v) 1
