Sagot :
Answer:
26-30 μ = 0(0.41) + 1(0.22) + 2(0.17) + 3(0.13) + 4(0.05) + 5(0.02) = 1.25
31-35 σ = 1.34
36-40 var = 1.81
See attached file for the solution.

Answer:
26-30 μ = 0(0.41) + 1(0.22) + 2(0.17) + 3(0.13) + 4(0.05) + 5(0.02) = 1.25
31-35 σ = 1.34
36-40 var = 1.81
See attached file for the solution.