Math
StatisticsEssentials of Statistics for the Behavioral SciencesAccording to a recent, people smile an average of μ = 62 time per day. Assuming that the distribution of smiles is approximately normal with a standard deviation of σ = 18, find each of the following values. a. What proportion of people smile more than 80 times a day? b. What proportion of people smile at least 50 times a day?

According to a recent, people smile an average of μ = 62 time per day. Assuming that the distribution of smiles is approximately normal with a standard deviation of σ = 18, find each of the following values. a. What proportion of people smile more than 80 times a day? b. What proportion of people smile at least 50 times a day?

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Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
Publisher: Cengage Learning
ISBN: 9781133956570
BuyFind

Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
Publisher: Cengage Learning
ISBN: 9781133956570

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Section
Problem 1P
Problem 2P
Problem 3P
Problem 4P
Problem 5P
Problem 6P
Problem 7P
Problem 8P
Problem 9P
Problem 10P
Problem 11P
Problem 12P
Problem 13P
Problem 14P
Problem 15P
Problem 16P
Problem 17P
Problem 18P
Problem 19P
Problem 20P
Problem 21P
Chapter 6, Problem 16P
Textbook Problem

According to a recent, people smile an average of μ = 62 time per day. Assuming that the distribution of smiles is approximately normal with a standard deviation of σ = 18, find each of the following values.

  1. a. What proportion of people smile more than 80 times a day?
  2. b. What proportion of people smile at least 50 times a day?

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Chapter 6,
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Chapter 6,
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Chapter 6 Solutions

Essentials of Statistics for the Behavioral Sciences
Ch. 6.1 - A survey of the students in a psychology class...Ch. 6.1 - A jar contains 10 red marbles and 30 blue marbles....Ch. 6.1 - Suppose that you are going to select a random...Ch. 6.2 - Find the proportion of a normal distribution that...Ch. 6.2 - For a normal distribution, find the z-score...Ch. 6.2 - The tail will be on the right-hand side of a...Ch. 6.3 - For a normal distribution with a mean of = 60 and...Ch. 6.3 - Scores on the Mathematics section of the SAT...Ch. 6.3 - What is the probability of selecting a score...Ch. 6 - A local hardware store has a Savings Wheel at the...
Ch. 6 - A psychology class consists of 14 males and 36...Ch. 6 - What are the two requirements for a random sample?Ch. 6 - Draw a vertical line through a normal distribution...Ch. 6 - Draw a vertical line through a normal distribution...Ch. 6 - Find each of the following probabilities for a...Ch. 6 - What proportion of a normal distribution is...Ch. 6 - Find each of the following probabilities for a...Ch. 6 - Find the z-score location of a vertical line that...Ch. 6 - Find the z-score boundaries that separate a normal...Ch. 6 - A normal distribution has a mean of = 70 and a...Ch. 6 - A normal distribution has a mean of = 30 and a...Ch. 6 - For a normal distribution with a mean of = 60 and...Ch. 6 - IQ test scores are standardized to produce a...Ch. 6 - The distribution of SAT scores in normal with =...Ch. 6 - According to a recent, people smile an average of ...Ch. 6 - A recent newspaper article reported the results of...Ch. 6 - Information from the Department of Motor Vehicles...Ch. 6 - A consumer survey indicates that the average...Ch. 6 - A report in 2010 indicates that Americans between...Ch. 6 - Rochester. New York, averages = 21.9 inches of...

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