MS 150 Statistics quiz 06 6.2 • Name:

Friend ages

The image above is from a FaceBook application called Friend Statistics. The image provides a histogram of the distribution of the ages of my friends on FaceBook. Calculate the estimated mean age in years for my friends by calculating ∑ x * p(x). Like many statistical situations in the "real world" the data does not come all pre-digested and ready to calculate. You must decide what to use for the classes. Suggestions: Use seven bins. Ignore the 144 friends who did not list their age. You decide how to handle the last class 45 years and older.

Age classes xFrequency (f)Relative Frequency p(x)x * p(x)

The mean age is: