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f. Find the IQR for the average of 7 cities. Q1 = ppm Q3 ppm IQR: ppm

f. Find the IQR for the average of 7 cities. Q1 = ppm Q3 ppm IQR: ppm

A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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I need help with the last qiestion, please and an explanation of how to solve it on TI84 calculator if possible. Thank you.

The amount of pollutants that are found in waterways near large cities is normally distributed with mean 9.2 ppm and standard deviation 1.6 ppm. 7 randomly selected large cities are studied. Round all answers to 4 decimal places where possible. a. What is the distribution of X? X - N( 9.2 b. What is the distribution of ? x - N 9.2 0.6047 c. What is the probability that one randomly selected city's waterway will have less than 9.2 ppm pollutants? 0.5000 d. For the 7 cities, find the probability that the average amount of pollutants is less than 9.2 ppm. 0.5000 1.6 e. For part d), is the assumption that the distribution is normal necessary? Yes No or f. Find the IQR for the average of 7 cities. Q1 = ppm Q3 = ppm IQR: ppm
Transcribed Image Text:The amount of pollutants that are found in waterways near large cities is normally distributed with mean 9.2 ppm and standard deviation 1.6 ppm. 7 randomly selected large cities are studied. Round all answers to 4 decimal places where possible. a. What is the distribution of X? X - N( 9.2 b. What is the distribution of ? x - N 9.2 0.6047 c. What is the probability that one randomly selected city's waterway will have less than 9.2 ppm pollutants? 0.5000 d. For the 7 cities, find the probability that the average amount of pollutants is less than 9.2 ppm. 0.5000 1.6 e. For part d), is the assumption that the distribution is normal necessary? Yes No or f. Find the IQR for the average of 7 cities. Q1 = ppm Q3 = ppm IQR: ppm
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