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eléphone numbers in the United States begin with 3 digit area codes followed by 7 digit local teléphone numbers. Area odes and local telephone numbers cannot begin with 0 or 1. How many telephone numbers are possible?

eléphone numbers in the United States begin with 3 digit area codes followed by 7 digit local teléphone numbers. Area odes and local telephone numbers cannot begin with 0 or 1. How many telephone numbers are possible?

College Algebra
College Algebra
10th Edition
ISBN:9781337282291
Author:Ron Larson
Publisher:Ron Larson
Chapter8: Sequences, Series,and Probability
Section8.6: Counting Principles
Problem 21E: License Plate Numbers In the state of Pennsylvania, each standard automobile license plate number...
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Telephone numbers in the United States begin with 3 digit area codes followed by 7 digit local telephone numbers. Area codes and local telephone numbers cannot begin with 0 or 1. How many telephone numbers are possible?
Transcribed Image Text:Telephone numbers in the United States begin with 3 digit area codes followed by 7 digit local telephone numbers. Area codes and local telephone numbers cannot begin with 0 or 1. How many telephone numbers are possible?
An online food delivery service in metro manila has a mean delivery time of 30 minutes with a standard deviation of 5 minutes. Assume that the distribution is normally distributed, what is the probability that the food will be delivered faster than 20 minutes? From this problem, answer the following questions. Note: For decimal numbers, round-off your answers into 4 decimal places. Prompts Find the standard normal z-value. The required mathematical notation in answering this problem is: What is the probability that the food will be delivered faster than 20 minutes?
Transcribed Image Text:An online food delivery service in metro manila has a mean delivery time of 30 minutes with a standard deviation of 5 minutes. Assume that the distribution is normally distributed, what is the probability that the food will be delivered faster than 20 minutes? From this problem, answer the following questions. Note: For decimal numbers, round-off your answers into 4 decimal places. Prompts Find the standard normal z-value. The required mathematical notation in answering this problem is: What is the probability that the food will be delivered faster than 20 minutes?
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