MATH 120 Introduction to Statistics Week 5, 6 & 7 Quiz
with Questions and Answers 2024/2025 Latest
Week 5 Quiz
1. Using the test scores in the table below, what is the variance of the scores on the exam? (Round
your answer to the nearest whole number.)<br />
A: 27
2. Using the test scores in the table below, what is the standard deviation of the scores on the
exam? (Round your answer to the nearest whole number.)
A: 5
3. Assume that 500,000 people take the GED exam (high school proficiency exam) each year and
their scores form a normal distribution. If Danny scores two standard deviations below the
mean, what percentile is he?
A: 2.5th
4. Assume that 500,000 people take the GED exam (high school proficiency exam) each year and
their scores form a normal distribution. If Tara scores one standard deviation above the mean,
what percentile is she?
A: 84th
5. Assume that 20 people take a math test, which is not enough for a normal distribution to form. If
Conrad scores three standard deviations above the mean, what percentile is he?
, A: Not enough information to determine.
6. Assume that 20 people take a math test, which is not enough for a normal distribution to form. If
Sarah scores at the median, what percentile is she?
A: 50th
7. Assume that 20 people take a math test, which is not enough for a normal distribution to form. If
Charlie scores at the mean, what percentile is he?
A: Not enough information to determine.
8. Compare the times of the two marathons runners in the table below. Which marathon runner is
more likely to win the marathon on any given day?
A: Runner 2
9. Compare the times of the two marathons runners in the table below. Which marathon runner
has a higher variance in her performance?
A: Runner 1
10. Typically, in the early stages of a country's transition from an emerging nation to a developed
nation, death rates fall while birth rates stay constant. What type of covariance do death rates
and birth rates have?
with Questions and Answers 2024/2025 Latest
Week 5 Quiz
1. Using the test scores in the table below, what is the variance of the scores on the exam? (Round
your answer to the nearest whole number.)<br />
A: 27
2. Using the test scores in the table below, what is the standard deviation of the scores on the
exam? (Round your answer to the nearest whole number.)
A: 5
3. Assume that 500,000 people take the GED exam (high school proficiency exam) each year and
their scores form a normal distribution. If Danny scores two standard deviations below the
mean, what percentile is he?
A: 2.5th
4. Assume that 500,000 people take the GED exam (high school proficiency exam) each year and
their scores form a normal distribution. If Tara scores one standard deviation above the mean,
what percentile is she?
A: 84th
5. Assume that 20 people take a math test, which is not enough for a normal distribution to form. If
Conrad scores three standard deviations above the mean, what percentile is he?
, A: Not enough information to determine.
6. Assume that 20 people take a math test, which is not enough for a normal distribution to form. If
Sarah scores at the median, what percentile is she?
A: 50th
7. Assume that 20 people take a math test, which is not enough for a normal distribution to form. If
Charlie scores at the mean, what percentile is he?
A: Not enough information to determine.
8. Compare the times of the two marathons runners in the table below. Which marathon runner is
more likely to win the marathon on any given day?
A: Runner 2
9. Compare the times of the two marathons runners in the table below. Which marathon runner
has a higher variance in her performance?
A: Runner 1
10. Typically, in the early stages of a country's transition from an emerging nation to a developed
nation, death rates fall while birth rates stay constant. What type of covariance do death rates
and birth rates have?
