21. A data professional is analyzing data about annual work income in dollars. They divide the data into quartiles: Q1 = $40,000, Q2 = $55,000, Q3 = $70,000. What value is the 50th percentile of their dataset?

  • $55,000
  • $40,000
  • $70,000
  • $30,000

22. If you apply the describe() function to numerical data, the results will include which of the following descriptive statistics?

  • Median
  • Range
  • Mean
  • Standard deviation

23. A data professional is analyzing data for an appliance manufacturer. As part of their analysis, they calculate the mean weight of a random sample of 100 microwaves. What concept best describes this value?

  • Statistic
  • Measure of dispersion
  • Population
  • Parameter

24. A data professional is analyzing data for an online store. They want to calculate the average time customers spend on the store’s website. What descriptive statistic do they use?

  • Mean
  • Mode
  • Range
  • Standard deviation

25. A data professional is working with the following dataset: 2, 2, 4, 7, 10. What is the median of the dataset?

  • 4
  • 5
  • 7
  • 2

26. Fill in the blank: Standard deviation measures how spread out your values are from the _____ of your dataset.

  • mean
  • mode
  • median
  • range

27. A data professional is analyzing data about annual work income in dollars. They divide the data into quartiles: Q1 = $40,000, Q2 = $55,000, Q3 = $70,000. What percentage of the values in their dataset are above $70,000?

  • 25%
  • 5%
  • 50%
  • 75%

28. If you apply the describe() function to categorical data, the results will include which of the following descriptive statistics?

  • Standard deviation
  • Mean
  • Mode
  • Median
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