Mean:
E[Y] = E[3X₁ + X₂]
E[Y] = 3 E[X₁] + E[X₂]
E[Y] = 3µ + µ
E[Y] = 4µ
Variance:
Var[Y] = Var[3X₁ + X₂]
Var[Y] = 3² Var[X₁] + 2 Covar[X₁, X₂] + 1² Var[X₂]
(the covariance is 0 since X₁ and X₂ are independent)
Var[Y] = 9 Var[X₁] + Var[X₂]
Var[Y] = 9σ² + σ²
Var[Y] = 10σ²
Answer:
8 is your answer ^_^
Step-by-step explanation:
Answer:
sorry I don't know tbh
Step-by-step explanation:
I not sure how to do this hope someone can help
Answer:
The answer will be listed below.
Step-by-step explanation:
I don't see any options, but to find a line with a slope of zero, the line must be straight either vertically or horizontally.
The answer is 1/2 a foot per hour