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?

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

  5.4 centimeters
• To what decimal place should the mean be given?

  One decimal place
• What are anomalous results?

  Results that do not fit the pattern
• How should you handle anomalous results when calculating the mean?

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

  10.5 grams
• What is the median?

  The middle value of a set of numbers
• How do you determine the median value?

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

  6
• What if there is an even set of numbers when finding the median?

  Take the mean of the two middle numbers
• What is the median value of the numbers 4, 8, 4, 7, 6, 3, 8, and 5?

  6.5
• What is the mode?

  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, 5?

  No mode exists
• 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
• What types of questions can you expect in exams regarding mean, median, and mode?

  • Calculate mean, median, and mode
  • Identify anomalous results
  • Determine if a mode exists