5. Solve the system of equations. x + y = 6 2x - y = 9
1 answer:
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Answer: 1.25
Step-by-step explanation:
Given: A college-entrance exam is designed so that scores are normally distributed with a mean = 500 and a standard deviation
= 100.
A z-score measures how many standard deviations a given measurement deviates from the mean.
Let Y be a random variable that denotes the scores in the exam.
Formula for z-score =
Z-score =
⇒ Z-score =
⇒Z-score =1.25
Therefore , the required z-score = 1.25
Answer:
Step-by-step explanation:
Adding 1 to both sides of the equation.
Factoring the left side of the equation.
Taking the square root of both sides of the equation.
Subtracting 1 from both sides of the equation.