Mean, median and mode

• What should you be able to calculate by the end of the video?

  Mean, median, and mode
• Why do students panic at the thought of maths?

  They believe it is difficult
• How do you calculate the mean of a set of values?

  Add all numbers and divide by count
• What is the mean value of the heights 5, 4, 7, 6, and 5?

  5.4 centimeters
• What should you do if you spot an anomalous result?

  Exclude it from the mean calculation
• What is the mean value of the masses 11, 13, 21, 10, and 8 excluding the anomalous result?

  10.5 grams
• How do you determine the median of a set of numbers?

  Order numbers and find the middle value
• What is the median value of the numbers 4, 8, 4, 7, 6, 3, and 8?

  6
• What do you do if there is an even set of numbers when calculating the median?

  Take the mean of the two central numbers
• What is the median value of the numbers 6 and 8?

  7
• What is the mode of a set of numbers?

  The number that appears most often
• What is the mode of the numbers 2, 5, 6, 6, 7, 7, 7, 9, and 10?


  7
• What happens if no number appears most often in a set?

  There cannot be a mode
• What is the mode of the numbers 1, 2, 3, 4, and 5?

  No mode
• What are the steps to calculate the mean, median, and mode?

  • Mean: Add values, divide by count
  • Median: Order values, find middle
  • Mode: Identify most frequent value
• How do you handle anomalous results in calculations?

  • Identify anomalous results
  • Exclude them from calculations
  • Recalculate mean or median