Central tendencies

• What is the mean?

  The average
• what is a strength of using the mean?

  + highly representative —> uses all values
• what is a weakness of the mean?

  easily distorted by extreme values
• what is the median?

  The middle value
• what is a strength of the median?

  not effected by extreme values
• what is a weakness of the median?

  less sensitive than the mean
• what is the mode?

  most frequent data
• what is bi-modal data?

  there are two modes
• what is a strength of using the mode?

  useful when data is in categories
• what is a weakness of the mode?

  can be unprepresentative