Consider the Following to Answer the Question(s) Below

Multiple Choice

Consider the following to answer the question(s) below:
An airline has found that its flights between Toronto and Vancouver can take anywhere from 4.5 to 7.5 hours, with any time between this range being equally likely.
-What is the standard deviation?

A) 0.75 hours
B) 0.87 hours
C) 6 hours
D) 0.33 hours
E) 0.5 hours