alleryVariance of fair die roll (1-6):
A3.5
B6
C1
D35/12 ≈ 2.92 (= ((6²-1)/12) for uniform discrete)
Answer & Solution
Correct answer: D. 35/12 ≈ 2.92 (= ((6²-1)/12) for uniform discrete)
For uniform discrete {1,2,...,n}: Var = (n²-1)/12. For n=6: 35/12. Mean = (n+1)/2 = 3.5. SD = sqrt(35/12) ≈ 1.71.
Keep practising Statistics and Probability
Browse all Statistics and Probability questions for GRE, or explore more Mathematics topics.