SOLUTION: I am totally dumb-founded on this problem. Can someone please HELP, and show me how you did it! Maybe if you show me just one or two of them I could do the rest of them............

Question 685145: I am totally dumb-founded on this problem. Can someone please HELP, and show me how you did it! Maybe if you show me just one or two of them I could do the rest of them............ ASAP!
Find the z-score corresponding to a score of x=100 for each of the following
Distributions:
a. �= 80 and σ=10
b. �=80 and σ= 5
c. �=105 and σ=10
d. �=105 and σ=5
Make sure to indicate the direction (sign) of the z-score.

Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
formula:
z = (x-μ)/σ
.
a. μ = 80 and σ = 10
z = (x-μ)/σ
z = (100-80)/10
z = 20/10
z = +2
.
b. μ = 80 and σ = 5
z = (x-μ)/σ
z = (100-80)/5
z = 20/5
z = +4
.
c. μ = 105 and σ = 10
z = (x-μ)/σ
z = (100-105)/10
z = -5/10
z = -0.5
.
d. μ = 105 and σ = 5
z = (x-μ)/σ
z = (100-105)/5
z = -5/5
z = -1

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