INTERPRETING GRAPHS OF NORMAL DISTRIBUTIONS Consider: The scaled test scores for Bukay Pait National High School Grade 11 Mathematics Test are normally distributed. The normal curve shown below...

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Extracted text: INTERPRETING GRAPHS OF NORMAL DISTRIBUTIONS Consider: The scaled test scores for Bukay Pait National High School Grade 11 Mathematics Test are normally distributed. The normal curve shown below represents this distribution. 550 600 650 700 750 800 Scaled test score Answer the following: 1. What is the mean test score? 2. Estimate the standard deviation of this normal distribution. 3. Interpret the graph. Solution: Because a normal curve is symmetric about the mean, you! can estimate that u = 675. Because the inflection points are one standard deviation from the mean, you can estimate that O= 35. 550 600 650 700 750 800 Scaled test score Interpretation: The scaled test scores for the Bukay Pait National High School Grade 11 Mathematics Test are normally distributed with a mean of about 675 and a standard deviation of about 35.


Extracted text: Activity: Try It Yourself: The scaled test scores for the New York State Grade 8 English Language Arts Test are normally distributed. The normal curve shown below represents this distribution. What is the mean test score? Estimate the standard deviation of this normal distribution. 580 600 620 640 660 680 700 720 Scaled test score Answer the following: 1. What is the mean test score? 2. Estimate the standard deviation of this normal distribution. 3. Interpret the graph.