averages of a data set

• Calculating the mean, median, mode and range of a data set

  1. Put numbers in ascending order

  2. Calculate mean by adding all numbers and dividing by total

  3. Mode is most common data value

  4. Median is middle number when ordered

  5. Range is largest minus smallest
• Mean is calculated by adding all numbers and dividing by total number of data values
• Mode is the most common data value
• Median is the middle number when the data is in order from smallest to largest
• Range is the difference between the largest and smallest data values
• It is possible to have more than one mode (bimodal or multimodal)
• Finding the value of a missing number when given the mean

  1. Add up all the given numbers

  2. Divide by total number of data values to get the mean

  3. Set up an equation using the mean and the missing number

  4. Solve the equation to find the missing number
• The mean of six numbers is 4, and the numbers are 2, 6, 7, X, 2, 3. Find the value of X.