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Answer:
The mean of T is 10 seconds
Step-by-step explanation:
The given parameters are;
The mean completion time of each step, μ = 10 seconds
The standard deviation, σ = 5 seconds
Each step is independent from the other steps
The variable that represents the total completion time for the three steps = T
We have the mean of T, , given by the combined mean as follows;
Where;
n₁ = n₂ = n₃ = 1, each step is taken only once, we have;
Therefore, the mean of T = 10 seconds