Osteoporosis is a condition in which bone density decreases, often resulting in broken bones. Bone density usually peaks at age 30 and decreases thereafter. To understand more about this condition a random sample of women aged 50 and over were recruited. Each woman's bone density loss and age are recorded in file Xr04-83.

a) Compute the mean and median of these data.
b) Compute the standard deviation of the bone density losses.
c) Compute the coefficient of determination for bone loss and women's age and describe what this statistic means.