Which of these is an example of a continuous random variable? 
a. number of heads when you flip a coin 5 times
b. number you roll on a die
c. number of boys in a class
d. height of 10-year-olds

Find the volume v of the solid obtained by rotating the region bounded by the given curves about the specified line. y = x â’ 1 , y = 0, x = 5; about the x-axis v = sketch the region. sketch the solid, and a typical disk or washer.