Question:
I have to find the mean from the following example:
| Price Range £000 | No of Houses |
| 55 and under 60 | 3 |
| 60 and under 65 | 6 |
| 65 and under 70 | 13 |
| 70 and under 80 | 21 |
| 80 and under 100 | 15 |
| 100 and under 130 | 7 |
| 130 upwards | 1 |
I know when calculating the mean you use the mid points of the classes, but how does this work for the 130 upwards class? Also, does this still work given the difference in the classes (ie. 1st class is 5, 5th class is 20, etc). Any help to get me started would be greatly appreciated.
