Example A certain type of magnetic disk must function in an environment where it is
exposed to corrosive gases. It is known that 10% of all such disks have
lifetimes less than or equal to 100 hours, 50% have lifetimes greater than 100
hours but less than or equal to 500 hours and 40% have lifetimes greater than
500 hours. Let Z represent the number of hours in the lifetimes of a randomly
chosen disk
a) Find P(Z<=500)

Name the bone/structure/process that fits the following description: a) a bone with a complex shape. b) found in the medullary cavity. c) a large, rough process. d) it is thin, like a plate. e) shaft of a long bone. f) a mature bone cell. g) a large, round, smooth process. h) it covers outer surface of bone. i) a shallow depression on surface of bone. j) a roughly cube-shaped bone. k) the covering of epiphysis. l) a very narrow ridge of bone. m) space between lamellae for an osteocyte. n) chamber within diaphysis o) also called wormian bone. p) it secretes new matrix. q) end of a long bone. r) a small, round hole. s) a matrix, arrangement in spongy bone. t) it is a chamber within a bone. u) a network allowing osteocytes to receive nutrients. v) one example is the patella. w) it houses artery, vein and nerve. x) almost flat, smooth surface of a bone. y) a narrow, pointed process.