using a tabular method to find out complete the cumulative frequencies , mean and standard deviation
how would I do this
Expenditures (£)
| Frequency
|
| Under 400 | 33 |
| 400 and under 600 | 27 |
| 600 and under 800 | 18 |
| 800 and under 1000 | 11 |
| 1000 and under 1200 | 8 |
| 1200 and under 1400 | 2 |
| 1400 and under 1600 | 3 |
| 1600 and under 1800 | 2 |
| 1800 and over | 1 |
| Total: | 105
|
Presumably you have been shown a particular way to fill out this table; it would be best to follow that example. I can tell you what I would do ...
First, they want cumulative frequencies; so make a third column and put 33 in the first row, 33+27 = 60 in the second, and so on.
Then they want the mean. For this you'll need a specific number to associate with each class, for which we typically use the midpoint. So make a fourth column (I'd have put it second) containing (0+400)/2 = 200 in the first line, and so on. Call this x. Then make a fifth column in which you put the frequency times the value for each row (fx), and add them up.
And so on. As I said, you have presumably been taught this, so I shouldn't have to teach the whole thing again; that's not what we're here for. What we want on this site is to see what you have tried and where you are stuck, so we can help you where you need it. (See our
submission guidelines.)
When it comes to standard deviation, there are several different formulas that can be used, so I'd definitely want to see which you are learning before showing you anything.
