Answer:
Step-by-step explanation:
The concept of variance in random variable is applied in solving for the value of c for the estimator cW1 + (1 − c)W2 to be most efficient. Appropriate differentiation of the estimator with respect to c will give the value of c when the result is at minimum.
The detailed analysis and step by step approach is as shown in the attachment.
58 is the angle to the answer
Answer: This is <u>not</u> a function
Why not?
The input x = 2 leads to more than one output. In this case, it leads to y = 20 and y = 40 simultaneously. This is the reason why we don't have a function. A function is only possible if each input x leads to exactly one y output.
Put another way: we cannot have x repeating any values if we want a function.
Side note: We could have y repeat however. So it's possible to have a function with the two points (1,5) and (3,5).
X 0 1 2 3 4
Y 2 3 4 5 6
Because in a graph that’s how it’ll be presented
Step-by-step explanation and the Answer:
Combine Like Terms. Now the equation looks like this: 
Then Subtract 
from both sides. Then the equation looks like this after u subtract from both sides: 
Now divide 
from both sides. Now the equation looks like this after u Divide from both sides: 
So therefore the answer is .
