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* The prices of pizzas can be described by a normal model with a mean of...
-99.7% -95% 68% The figure illustrates a normal distribution for the prices paid for a particular...
-99.7% -95% 68% The figure illustrates a normal distribution for the prices paid for a particular model of a new car. The mean is $13,000 and the standard deviation is $500. Use the 68-95-99.7 Rule to find the percentage of buyers who paid between $11,500 and $13,000. Number of Car Buyers 11.300 12.000 12.500 13.000 0.00 14.000 Price of a Model of a New Car 14.500 What percentage of buyers paid between $11,500 and $13,000?
Fuel economy estimates for automobiles built one year predicted a mean of 26.8 mpg and a...
Fuel economy estimates for automobiles built one year predicted a mean of 26.8 mpg and a standard deviation of 5.2 mpg for highway driving. Assume that a Normal model can be applied. Use the 68-95-99.7 Rule to complete parts a) through e) a) Draw the model for auto fuel economy. ОА. OC A A A 14 21 b) In what interval would you expect the central 95% of autos to be found? Using the 88-95-99.7 rule, the central 95% of...
-99.7% -95% Not everyone pays the same price for the same model of a car. The...
-99.7% -95% Not everyone pays the same price for the same model of a car. The figure illustrates a normal distribution for the fc prices paid for a particular model of a new car. The mean is $18,000 and the O standard deviation is $2000. Use the 68-95-99.7 Rule to find what percentage of buyers paid between $14,000 and $22,000. 12 14 1618 20 2224 Price of a Model of a New Car (Thousands) The percentage of buyers who paid...
Grade percentages for STAT 302 students can be described using a bell-curve distribution with a mean...
Grade percentages for STAT 302 students can be described using a bell-curve distribution with a mean of 82.7% and a standard deviation of 5.3%. (a) Using the 68-95-99.7 rule, what percent of students have grade percentages that are at least 93.3%? How do you solve this? (correct answer is 2.5%) (b) Using the 68-95-99.7 rule, about 50% of students have grade percentages less than what percent? How do you solve this? (correct answer is 82.7%)
2. Some IQ tests are standardized to a Normal model with a mean of 100 and...
2. Some IQ tests are standardized to a Normal model with a mean of 100 and a standard deviation of 16. a. What score would begin the interval for the top 16% of all scores? Use the Empircal Rule (68/95/99.7%) to find your answer. Validate this answer using the Z-scores table. b. The top 10% of all scores represent the label of "genius". What is the range of scores for anyone who qualifies as a genius? C. What proportion of...
In the last quarter of 2007, a group of 64 mutual funds had a mean return...
In the last quarter of 2007, a group of 64 mutual funds had a mean return of 5.5% with a standard deviation of 6.1%. If a normal model can be used to model them, what percent of the funds would you expect to be in each region? Use the 68-95-99.7 rule to approximate the probabilities rather than using technology to find the values more precisely. Be sure to draw a picture first. a) Returns of 23.8% or more c) Returns...
In the last quarter of 2007, a group of 64 mutual funds had a mean return...
In the last quarter of 2007, a group of 64 mutual funds had a mean return of 5.5% with a standard deviation of 7.7%. If a normal model can be used to model them, what percent of the funds would you expect to be in each region? Use the 68-95-99.7 rule to approximate the probabilities rather than using technology to find the values more precisely. Be sure to draw a picture first. a) Returns of negative 17.6% or less ...
100 7.62 Weights in kilograms of boys at the start of 1st grade are approximately normal...
100 7.62 Weights in kilograms of boys at the start of 1st grade are approximately normal with mean 25, standard deviation 5. Use the 68-95-99.7 Rule to estimate the following weights: a. The probability is 0.002 that a boy at the start of 1st grade is less than what weight? b. The probability is 0.12 that a boy at the start of 1st grade is more than what weight?
In the last quarter of 2007, a group of 64 mutual funds had a mean return of 2.9% with a standard deviation of 4.1%. If...
In the last quarter of 2007, a group of 64 mutual funds had a mean return of 2.9% with a standard deviation of 4.1%. If a normal model can be used to model them, what percent of the funds would you expect to be in each region? Use the 68-95-99.7 rule to approximate the probabilities rather than using technology to find the values more precisely. Be sure to draw a picture first. a) Returns of 7.0% or more b) Returns...
In the last quarter of 2007, a group of 64 mutual funds had a mean return...
In the last quarter of 2007, a group of 64 mutual funds had a mean return of 2.7% with a standard deviation of 7.6%. If a normal model can be used to model them, what percent of the funds would you expect to be in each region? Use the 68-95-99.7 rule to approximate the probabilities rather than using technology to find the values more precisely. Be sure to draw a picture first. a) Returns of-12.5% or less b) Returns of...
-99.7% -95% 68% The figure illustrates a normal distribution for the prices paid for a particular model of a new car. The mean is $13,000 and the standard deviation is $500. Use the 68-95-99.7 Rule to find the percentage of buyers who paid between $11,500 and $13,000. Number of Car Buyers 11.300 12.000 12.500 13.000 0.00 14.000 Price of a Model of a New Car 14.500 What percentage of buyers paid between $11,500 and $13,000?
Fuel economy estimates for automobiles built one year predicted a mean of 26.8 mpg and a standard deviation of 5.2 mpg for highway driving. Assume that a Normal model can be applied. Use the 68-95-99.7 Rule to complete parts a) through e) a) Draw the model for auto fuel economy. ОА. OC A A A 14 21 b) In what interval would you expect the central 95% of autos to be found? Using the 88-95-99.7 rule, the central 95% of...
-99.7% -95% Not everyone pays the same price for the same model of a car. The figure illustrates a normal distribution for the fc prices paid for a particular model of a new car. The mean is $18,000 and the O standard deviation is $2000. Use the 68-95-99.7 Rule to find what percentage of buyers paid between $14,000 and $22,000. 12 14 1618 20 2224 Price of a Model of a New Car (Thousands) The percentage of buyers who paid...
2. Some IQ tests are standardized to a Normal model with a mean of 100 and a standard deviation of 16. a. What score would begin the interval for the top 16% of all scores? Use the Empircal Rule (68/95/99.7%) to find your answer. Validate this answer using the Z-scores table. b. The top 10% of all scores represent the label of "genius". What is the range of scores for anyone who qualifies as a genius? C. What proportion of...
In the last quarter of 2007, a group of 64 mutual funds had a mean return of 5.5% with a standard deviation of 6.1%. If a normal model can be used to model them, what percent of the funds would you expect to be in each region? Use the 68-95-99.7 rule to approximate the probabilities rather than using technology to find the values more precisely. Be sure to draw a picture first. a) Returns of 23.8% or more c) Returns...
100 7.62 Weights in kilograms of boys at the start of 1st grade are approximately normal with mean 25, standard deviation 5. Use the 68-95-99.7 Rule to estimate the following weights: a. The probability is 0.002 that a boy at the start of 1st grade is less than what weight? b. The probability is 0.12 that a boy at the start of 1st grade is more than what weight?
In the last quarter of 2007, a group of 64 mutual funds had a mean return of 2.7% with a standard deviation of 7.6%. If a normal model can be used to model them, what percent of the funds would you expect to be in each region? Use the 68-95-99.7 rule to approximate the probabilities rather than using technology to find the values more precisely. Be sure to draw a picture first. a) Returns of-12.5% or less b) Returns of...
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