Historical data show that customers who download music from a popular Web service spend approximately $20 per month with a standard deviation of $4. 1. Find the probability that a customer will spend more than $15 per month. 2. If the company samples 100 customers, find the mean and standard deviation of the number who spend more than $15 per month. 3. What is the probability that more than 40% of them will spend more than $15 per month? Tips: Use normal distribution to model sales.
Historical data show that customers who download music from a popular Web service spend approximately $20 per month with a standard deviation of $4. 1. Find the probability that a customer will spend more than $15 per month. 2. If the company samples 100 customers, find the mean and standard deviation of the number who spend more than $15 per month. 3. What is the probability that more than 40% of them will spend more than $15 per month? Tips: Use normal distribution to model sales.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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Historical data show that customers who download music from a popular Web service spend approximately $20 per month with a standard deviation of $4.
1. Find the probability that a customer will spend more than $15 per month.
2. If the company samples 100 customers, find the mean and standard deviation of the number who spend more than $15 per month.
3. What is the probability that more than 40% of them will spend more than $15 per month?
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