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What is the formula for z scores?
Z = (x minus mu) divided by sigma.
What is the quadratic root of z squared plus 9z plus 18 equals 0?
use the quadratic formula. when done so the roots are z=-3, and z=-6
How do I find the Z score for tests with mean of 100 and a standard deviation of 20?
Z = (x-mu)/sigma. So, for your example, any x value can be transformed to Z-score by the formula Z = (x-100)/20.
X y - z when x 783 y 472 z 322?
Answer : 369,254. If you are multiplying X and Y, then subtracting Z. So your formula should look like: (XY) - Z. Where, X = 783, Y = 472, and Z = 322 So that, X times Y is used to subtract Z. You should get 369,254.
What is the formula for calculating the depth of liquid in a sphere?
Consider a sphere of radius r. Let the z-axis be the vertical axis and suppose the sphere's centre is at z = 0. [Thus the sphere goes from z = -r to z = r.] Suppose the volume of liquid in it is V. Then you need to sove 3V/pi = 3r2z - z3 + 3r3 - r3 = 3r2z - z3 + 2r3 for z. Then, the depth is z + r
