Measure of central tendency (ungrouped)

• Mean - Commonly called the average (sum of all numbers divided to n)
• Median - The middle number in a set of data when the number is arranged in ascending or descending order.
• Find the median: 44, 21, 59, 64, 74, 57, 69?

  59
• find the median: 111, 102, 92, 98, 96, 106?

  Median: 100
• find the median: 34, 11, 49, 54, 64, 59, 47?

  49
• mode - the most common value in a data set, the value that occurs most often
• trimodal - 3 modes
• multimodal - 4 or more mode
• bimodal - 2 or mode
• unimodal - one mode
• find the mode: 5, 7, 9, 10, 7, 12, 10, 15, 10?

  mode: 10 unimodal
• mode 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4,?


  mode: 1, 2, 3, 4 multimodal
• mode: 1, 2, 3, 1, 2, 3, 3?


  mode: 3 unimodal
• mode: 11, 12, 13, 14, 15, 16, 17, 18, 19?

  mode: no mode