Aflea of negligible size is trapped in a large, spherical, inflated beach ball with radius r.

at this moment, it is equally likely to be at any point within the ball. let x be the distance of the flea from the center of the ball.

using the fact that the volume of a sphere of radius r is 4tr 3, for x, find

a) . . the cumulative distribution function

b) . . the probability density function fx