MEAN BASED
QUESTIONS
1. Is it true to say that the mean, mode and median of grouped data will always be different. Justify your answer.
2. The mean of ungrouped data and the mean calculated when the same data is
grouped are always the same. Do you agree with this
statement? Give reason for your answer.
3. Find the mean of the distribution:
Class 1-3 3-5 5-7 7-9
Frequency 9 22 27 17
4. Daily wages of 110 workers, obtained in a survey, are tabulated below:
Daily wages (in Rs.) 100 - 120 120 - 140 140 - 160 160 - 180 180 - 200 200 - 220
No. of workers 15 18 25 22 18 12
Determine the mean wages of workers.
5. Calculate the mean of the scores of 20 students in a mathematics test :
Marks 0-10 10-20 20-30 30-40 40-50
7. The following table gives the number of pages written by Sarika for completing her own book for 30 days :
No. of pages written per day 16-18 19-21 22-24 25-27 28-30
No. of days 1 3 4 9 13
Find the mean number of pages written per day.
8. The daily income of a sample of 50 employees are tabulated as follows :
Income(in Rs.)
1-200 No. of employees 14
201-400 15
401-600 14
601-800 7
9. The weights (in kg) of 50 wrestlers are recorded in the following table :
Weight(in kg) 100-110 110-120 120-130 130-140 140-150
No. of wrestlers 4 14 21 8 3
Find the mean weight of the wrestlers.
10. An aircraft has 120 passenger seats. The number of seats occupied during 100 flights is given below:
No. of seats 100-104 104-108 108-112 112-116 116-120
Frequency 15 20 32 18 15
Determine the mean number of seats occupied over the flights
| First Name | Last Name | Email Address |
|---|---|---|
| Hillary | Nyakundi | tables@mail.com |
| Lary | Mak | developer@mail.com |
