Using the Central Limit Theorem · Exercise 29

Richard’s Furniture Company delivers furniture from 10 A.M. to 2 P.M. continuously and uniformly. We are interested in how long (in hours) past the 10 A.M. start time that individuals wait for their delivery.

Suppose that it is now past noon on a delivery day. The probability that a person must wait at least one and a half more hours is:

(a) $\frac{1}{4}$
(b) $\frac{1}{2}$
(c) $\frac{3}{4}$
(d) $\frac{3}{8}$

Its source prints no answer for this problem, so there's nothing to check against.

OpenStax, Introductory Statistics 2e · §7.3 Using the Central Limit Theorem · Exercise 29