Let , , , and be a random sample of observations from a population with mean and variance . Consider the following estimator of : = 0.15 + 0.35 + 0.20 + 0.30 . What is the variance of ?
A)
B)
C)	0.55
D)
Answer:B
Let , , , and be a random sample of observations from a population with mean and variance . Consider the following estimator of : = 0.15 + 0.35 + 0.20 + 0.30 . What is the variance of ?
A) B) C)	0.55 D)