Facebook provides a variety of statistics on its website that detail the growth and popularity of the site. On average, 18 to 34 year olds use their Facebook app an average of 120 minutes per day. This usage is normally distributed with

Sigma (o)=25.

a. Suppose that Owen spends 137 minutes using the Facebook app on his phone per day. How many standard deviations away from the mean is Owen's usage? Is it above or below the mean? Please include a sketch to that details this situation.

b What percentage of 18 to 34 year old Facebook users use the app less than Owen?

c. Now, suppose that Ben uses it for 70 minutes per day. What percentage 18 to 34 Facebook users use more than Ben but less than Owen?