Ameasure of the average value of a random variable is called a(n):
-variance-standard deviation-expected value-coefficient of variation

Expected value

Step-by-step explanation:

The expected value is a parameter that represents the central point of random variable distribution, also know as the mean or the average value.

The other three parameters listed all measure the deviation or dispersion from that central value.

Therefore, the correct answer is expected value.

Z-m=z+bx
First, let's subtract z from each side:
z-m-z = z+bx-z
-m=bx
Then, to find x, you divide both sides by b to get the variable x alone on a side, and the others on another side:
-m/b = bx/b
-m/b = x

So, in z-m = z+bx, x = -m/b

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