It is known
The grouped data is the capital of 40 company populations (in millions of rupiah).
| Kelas | f | d | d2 | fd | fd2 |
|---------|---------|--------|-----------|-----------|------------|
| 118-126 | 3 | -3 | 9 | -9 | 27 |
| 127-135 | 5 | -2 | 4 | -10 | 20 |
| 136-144 | 9 | -1 | 1 | -9 | 9 |
| 145-153 | 12 | 0 | 0 | 0 | 0 |
| 154-162 | 5 | 1 | 1 | 5 | 5 |
| 163-171 | 4 | 2 | 4 | 8 | 16 |
| 172-180 | 2 | 3 | 9 | 6 | 18 |
| Jumlah | ∑f = 40 | ∑d = 0 | ∑ d2 = 28 | ∑ fd = -9 | ∑ fd2 = 95 |So that;
- C = 9,
- N = ∑f = 40
- ∑ fd = -9
- ∑ fd2 = 95
Asked
What is the standard deviation?
Completion
So, the standard deviation is 13.72 million rupiah.