defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Probability Mean and Variance of Random variables
A coin is tossed three times. Let X denote the number of times a tail follows a head. If μ and σ2 denote the mean and variance of X, then the value of 64(μ + σ2) is :
1
51
2
48
3
32
4
64