Let X be the number of classes taken by a college student in a semester. Use the formula for the mean of a discrete random variable X to answer this problem: ?x = ? xi pi If 40% of all the students are taking four classes, and 60% of all the students are taking three classes, what is the mean (average) number of classes taken for this group of students? A. 3.0 B. 3.2 C. 3.4 D. 3.6 E. 3.8
Added by Gregg M.
Close
Step 1
- \( x_1 = 4 \) (number of classes for 40% of students) - \( p_1 = 0.40 \) (probability of taking 4 classes) - \( x_2 = 3 \) (number of classes for 60% of students) - \( p_2 = 0.60 \) (probability of taking 3 classes) Show more…
Show all steps
Your feedback will help us improve your experience
Lucas Finney and 59 other Elementary Statistics a Step by Step Approach educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Let X be the number of classes taken by a college student in a semester. Use the formula for the mean of a discrete random variable X to answer this problem: Image If 40% of all the students are taking four classes, and 60% of all the students are taking three classes, what is the mean (average) number of classes taken for this group of students? A. 3.0 B. 3.2 C. 3.4 D. 3.6 E. 3.8
Tim T.
Let X be the number of classes taken by a college student in a semester. Use the formula for the mean of a discrete random variable X to answer this problem: Image If half of the students in a class are age 18, one-quarter are age 19, and one-quarter are age 20, what is the average age of the students in the class? A. 18.10 B. 18.35 C. 18.65 D. 18.75 E. 19.05
Lucas F.
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD