Business Statistics Old Question Paper Year 2018
Group “A”
Brief Answer Questions: [4×2=8]
- 1) What is sampling? List down the various random sampling techniques.
- 2) One hundred and twenty Students appeared for a English class test and following are the marks distribution.
| Marks | 0-20 | 20-40 | 40-60 | 60-80 | 80-100 |
| No. of students | 10 | 25 | 40 | 30 | 15 |
Find the modal marks of the students.
- 3) A bag contains 3 red, 2 black and 5 white balls. If two balls are drawn at random, what is the probability of getting () both red balls (ii) both white balls.
- 4) A random sample of 100 patients suffering from a certain disease was given a serum treatment. It was observed that 80% were relieved of the disease. Find 99% confidence limits for the percentage of patients cured.