STAT 245 Lecture Notes - Lecture 3: Mutual Exclusivity

STAT 245.3 – Exercises #3

Solutions

PROBLEM A: How physically active are students? A random sample of students was obtained

by sampling student numbers from a list of such numbers for current students. Each student

indicated a Level of Physical Activity and his/her Gender. The following table summarizes

the results obtained.

Suppose one person is chosen at random from those studied. For questions 1 to 6, determine the

probabilities that the person so chosen: (Note: Show how you calculate your answers using the

numbers given in the above table, then present answers correct to four places of decimal.)

Let 𝐹 denote Female,

𝐿 denote Low activity level,

2. is not a "female with high activity"

4. does not have a High activity level