A box contains 15 green and 10 yellow balls. If 10 balls are randomly drawn, one-by-one, with replacement, then the variance of the number of green balls drawn is:

- 12/5
- 6
- 4
- 6/25

**Solution**

p = 15/25

q = 10/25

n = 10

σ^{2} = npq

= 12/5

**The correct option is A.**