Question
At a hospital, a doctor compiled the following data about 400 patients whom he could cure of hepatitis:
|
Time for cure |
No. of patients |
|
< 1 month |
210 |
|
1–2 months |
105 |
|
2-3 months |
60 |
|
> 3 months |
25 |
Another case of hepatitis is reported. What is the probability that this patient will be cured in
(i) less than 2 months?
(ii) 1 month or more but not more than 3 months?
Solution
Total number of patients = 400
(i) Number of patients who were cured in less than 2 months = 210+ 105 = 315
∴ Probability that the patient will be cured in less than 2 months = 
(ii) Number of patients who were cured in 1 month or more but not more than 3 months
= 105 + 60 = 165
∴ Probability that the patient will be cured in
1 month or more but not more than 3 months 
