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=40/8 = 5
|Xi | (Xi-x) | (Xi-x)²|
4. -1. 1
4. -1. 1
6. 1. 1
3. -2. 4
7. 2. 4
4. -1. 1
5. 0. 0
7. 2. 4
jumlah: 16
S= √£(Xi - x)²/n
=√16/8
=√2
jwbn :c.akar 2
semoga membantu maaf kl salah