Statistics (PYQs)
1. If the mean of the first n natural number is 15, then find n.
View AnswerAns.
2. Find the class-marks of the classes 10-25 and 35-55.
View AnswerAns.
3. Find the mean of the following distribution:
Ans.
4. The mean of the following frequency distribution is 62.8 and sum of all frequencies is 50. Find the missing frequencies f1 and f2.
Ans.
5. The arithmetic mean of the following frequency distribution is 53. Find the value of k.
Ans.
6. A class teacher has the following absentee record of 40 students of a class for the whole term. Find the mean number of days a student was absent.
Ans.
7. The mileage (km per litre) of 50 cars of the same model was tested by a manufacturer and details are as follows:
Find the mean mileage. The manufacturer claimed that the mileage of the model was 16 km/l. Do you agree with this claim?
View AnswerAns.
8. The following distribution shows the daily pocket allowance of children of a locality. The mean pocket allowance is ` 18. Find the missing frequency k.
Ans. k = 8
9. The marks distribution of 30 students in a science examination are as follows. Find the mode of this data.
Ans.
10. The distribution below gives the marks of 30 students of a class in mathematics. Find the median marks of the students.
Ans.
11. Find the mode of the following data:
Ans.
12. The weight of tea in 70 packets are as follows:
Determine the modal weight
View AnswerAns.
13. The annual rainfall record of a city of 100 days is given in the following table:
Calculate the median rainfall.
View AnswerAns. 39.09 cm
14. The following table shows the ages of the patients admitted in a hospital during a year:
Find the median of the data given above.
View AnswerAns. 21.25 years
15. The table below shows the salaries of 280 persons
Calculate the median salary of the data
View AnswerAns.
16. The table shows the daily expenditure on grocery of 25 households in a locality. Find the modal daily expenditure on grocery by a suitable method.
Ans.
17. The median of the following data is 16. Find the missing frequencies a and b, if the total of the frequencies is 70
Ans.
18. Daily wages of 110 workers, obtained in a survey, are tabulated below
Compute the mean daily wages and modal daily wages of these workers.
View AnswerAns.
19. The distribution given below shows the number of wickets taken by bowlers in one-day cricket matches. Find the mean and the median of the number of wickets taken.
Ans.
20. The mode of the following data is 67. Find the missing frequency x.
Ans.
