Find the mean, median, mode, and range of a number set, and find a missing value when given an average.
Median: put the values in order, then take the middle one. With an even count, average the two middle values.
Range = largest value − smallest value.
Question 1 of 4
An apartment manager replaced the air conditioners. The list shows how many years each had been in service: 12.2, 13.7, 11.9, 13.4, 11.9, 12.3, 12.9, 11.8, 13.3, 13.6.
What is the median number of years that an air conditioner had been in service?