Solve the quadratic equation Y=2x^2-4x
1 answer:
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Z-score for 80% to pass = -0.842.
-60.624 = X - 426
X = 426 - 60.624
X = 365
Therefore the required passing score is 365.
-60.624 = X - 426
X = 426 - 60.624
X = 365
Therefore the required passing score is 365.
To solve this you can make a proportion where the matching sides will correspond to each other. It should look something like this:
Now you must cross multiply
10*42 = 15*x
420= 15x
To isolate x divide 15 to both sides
420/15 = 15x/15
28 = x
Hope this helped!
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