The water bills (in rupees) of 32 houses in a locality are given below:
30, 48, 52, 78, 103, 85, 37, 94, 72, 73, 66, 52, 92, 65, 78, 81, 64, 60, 75, 78, 108, 63, 71, 54, 59, 75, 100, 103, 35, 89, 95, 73.
Taking class intervals 30-40, 40-50, 50-60, ….. , form frequency distribution table. Construct a combined histogram and frequency polygon.
Solution:
| Class Intervals | Tally Marks | Frequency |
| 30-40 | III | 3 |
| 40-50 | I | 1 |
| 50-60 | IIII | 4 |
| 60-70 | 5 | |
| 70-80 | 9 | |
| 80-90 | III | 3 |
| 90-100 | III | 3 |
| 100-110 | IIII | 4 |
Take class intervals on x-axis and frequency on y-axis:
More Solutions:
- The class marks of a frequency distribution are given:
- A grouped frequency distribution table with class intervals:
- If the mean of x1, x, is 7.5, and the mean of x1, X2, x3 is;
- The mean of 100 observations is 50.
- For drawing a frequency polygon of a continuous frequency distribution.
- The mean and the median of the following set of numbers:
- Find the mean and the median of all the (positive) factors of 48.
- Find the mean weight of the remaining students.
- What is the new mean age?