In a certain normal distribution of scores, the mean is 40 and the standard deviation is 3. Find the z-score corresponding to a
2 answers:
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(B)
Step-by-step explanation:
Rewrite the equations into their standard forms. The first one can be rewritten as
and the 2nd can be rewritten as
Solving this system either by substitution or elimination, we get
If you add x + y, you'll get a negative number.