defence exam Indian Coast Guard Assistant Commandant (GD/CPL) 2025 Test Series Mathematics Probability Mean and Variance of Random variables
A box contains 10 blue and 5 red balloons.If 5 balloons are randomly drawn, one-by-one, with replacement, then the variance of the number of blue balloons drawn is?
1
10
2
9
3
\( \rm \frac{10}{9}\)
4
\( \rm \frac{9}{10}\)