Johnny is “paid” by his parents $20 if he gets a grade A, $10 if he gets a grade B, whereas he has to pay his parents back $5 if he gets a grade other than A or B. On average 20% of the grades he gets are A, and 30% are grades B. 1. What is the expected value of what he “earns” per grade? 2. What is the expected value of what he “earns” at school weekly if on average he gets five grades a week? 3. How long should Jim save until he collects enough money to buy a pair of brand new Hi-Fi headphones that cost $225 ?
Johnny is “paid” by his parents $20 if he gets a grade A, $10 if he gets a grade B, whereas he has to pay his parents back $5 if he gets a grade other than A or B. On average 20% of the grades he gets are A, and 30% are grades B. 1. What is the expected value of what he “earns” per grade? 2. What is the expected value of what he “earns” at school weekly if on average he gets five grades a week? 3. How long should Jim save until he collects enough money to buy a pair of brand new Hi-Fi headphones that cost $225 ?
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section: Chapter Questions
Problem 35T
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Johnny is “paid” by his parents $20 if he gets a grade A, $10 if he gets a grade B, whereas he has to pay his parents back $5 if he gets a grade other than A or B. On average 20% of the grades he gets are A, and 30% are grades B.
1. What is the
2. What is the expected value of what he “earns” at school weekly if on average he gets five grades a week?
3. How long should Jim save until he collects enough money to buy a pair of brand new Hi-Fi headphones that cost $225 ?
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