Mathematics
The contents of 100 matchboxes were checked to determine the number of matches they contained.
| No. of matches | No. of boxes |
|---|---|
| 35 | 6 |
| 36 | 10 |
| 37 | 18 |
| 38 | 25 |
| 39 | 21 |
| 40 | 12 |
| 41 | 8 |
(i) Calculate, correct to one decimal place, the mean number of matches per box.
(ii) Determine how many extra matches would have to be added to the total contents of the 100 boxes to bring the mean upto exactly 39 matches.
Related Questions
Find the mean of 25 given numbers when the mean of 10 of them is 13 and the mean of the remaining numbers is 18.
Find the mean of the following distribution :
Number Frequency 5 1 10 2 15 5 20 6 25 3 30 2 35 1 Find the mean for the following distribution by short cut method:
Numbers Cumulative Frequency 60 8 61 18 62 33 63 40 64 49 65 55 66 60 Category Wages in ₹ per day No. of workers A 50 2 B 60 4 C 70 8 D 80 12 E 90 10 F 100 6 G 110 8 (i) Calculate the mean wage, correct to nearest rupee.
(ii) If the number of workers in each category is doubled, what would be the new mean wage?