text: # What is the average of 75 and 105?
  
  Feb 14, 2017
  
  Average (mean) = $90$
  
  #### Explanation:
  
  There are 3 different types of "average" - but I assume this refers to the "mean".
  
  To find an average (or the mean) of two numbers, add them together and divide by 2.
  
  In general, Mean = $\text{sum of all the values"/"the number of values}$
  
  Average = $\frac{75 + 105}{2} = \frac{180}{2} = 90$
  
  From this we can see that:
  
  One value is above and one is below the average.
  They differ from the mean by the same amount so that the mean is exactly between them.