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Sample Question of the Day
Dropdown📘 S.ID.A.4🧠 DOK 1
Question:
A researcher is analyzing the test scores of a large group of high school students. The scores are normally distributed with a mean of 75 and a standard deviation of 10. What percentage of students scored below 65?
Answer Choices:
- A) 16%
- B) 32%
- C) 50%
- D) 68%
✅ Answer:
16%
💡 Explanation:
In a normal distribution, scores below one standard deviation from the mean (mean - 1 standard deviation) account for approximately 16% of the data.
Since the mean is 75 and the standard deviation is 10, scores below 65 (which is one standard deviation below the mean) represent 16% of the population.
Standard: S.ID.A.4 | DOK: 1