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The amount of cola in a 12 -ounce can is uniformly distributed between 11.96 ounces and 12.05 ounces. a. What is the mean amount per can? b. What is the standard deviation amount per can? c. What is the probability of selecting a can of cola and finding it has less than 12 ounces? d. What is the probability of selecting a can of cola and finding it has more than 11.98 ounces? e. What is the probability of selecting a can of cola and finding it has more than 11.00 ounces?

Short Answer

Expert verified
a. 12.005 ounces b. 0.02598 ounces c. 0.4444 d. 0.7778 e. 1

Step by step solution

01

Understand the Distribution

The amount of cola is uniformly distributed between 11.96 ounces and 12.05 ounces. In a uniform distribution, every value between these two points is equally likely.
02

Calculate the Mean

For a uniform distribution, the mean is the average of the lowest and highest values. Therefore, the mean \( \mu \) is calculated as follows:\[ \mu = \frac{(11.96 + 12.05)}{2} \]
03

Calculate the Numerical Mean

Calculate the mean using the provided values:\[ \mu = \frac{(11.96 + 12.05)}{2} = 12.005 \] Thus, the mean amount per can is 12.005 ounces.
04

Calculate the Standard Deviation

The standard deviation \( \sigma \) for a uniform distribution is found using:\[ \sigma = \frac{b - a}{\sqrt{12}} \]where \( a = 11.96 \) and \( b = 12.05 \).
05

Compute Standard Deviation

Substitute the values into the formula:\[ \sigma = \frac{12.05 - 11.96}{\sqrt{12}} = \frac{0.09}{\sqrt{12}} \approx 0.02598 \]Thus, the standard deviation amount per can is approximately 0.02598 ounces.
06

Calculate Probability for Less than 12 Ounces

To find the probability of a can having cola less than 12 ounces, calculate the proportion of the distribution that is below 12.\[ P(X < 12) = \frac{12 - 11.96}{12.05 - 11.96} = \frac{0.04}{0.09}\]
07

Solve Probability for Less than 12 Ounces

Calculate the probability:\[ P(X < 12) = \frac{0.04}{0.09} \approx 0.4444 \]Therefore, the probability of finding a can with less than 12 ounces is approximately 0.4444.
08

Calculate Probability for More than 11.98 Ounces

Calculate the proportion of the distribution that is more than 11.98 ounces:\[ P(X > 11.98) = \frac{12.05 - 11.98}{12.05 - 11.96} = \frac{0.07}{0.09}\]
09

Solve Probability for More than 11.98 Ounces

Calculate the probability:\[ P(X > 11.98) = \frac{0.07}{0.09} \approx 0.7778 \]Thus, the probability of finding a can with more than 11.98 ounces is approximately 0.7778.
10

Calculate Probability for More than 11.00 Ounces

Since 11.00 ounces is below the minimum of the distribution (11.96 ounces), the probability is 1:\[ P(X > 11.00) = 1 \]This means every can is more than 11.00 ounces.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Mean Calculation
When discussing a uniform distribution, the mean is used to determine the expected average value over the range of the distribution. It's essentially the balance point of the distribution, where if thought of physically, the distribution would perfectly balance on a point. In a uniform distribution which is continuous, the mean is calculated by averaging the two boundary values of the range.

For example, if we're looking at a can of cola with a uniform distribution from 11.96 ounces to 12.05 ounces, the mean is calculated using the formula:\[ \mu = \frac{a + b}{2} \]Here, \( a \) represents the lower boundary and \( b \) the upper boundary. Plugging in the given values:\[ \mu = \frac{11.96 + 12.05}{2} = 12.005 \]Thus, the mean amount of cola per can is 12.005 ounces. This mean value or average is important as it provides a central point around which measurements are expected to cluster.
Standard Deviation Calculation
The standard deviation is a measure of the amount of variation or dispersion in a set of values. In the context of a uniform distribution, it helps us understand how spread out the values are from the mean. The smaller the standard deviation, the closer the values tend to be to the mean.

Standard deviation in a uniform distribution is calculated with the formula:\[ \sigma = \frac{b - a}{\sqrt{12}} \]In this equation, \( a \) and \( b \) again denote the lower and upper boundaries of the distribution, respectively. For our cola can example:\[ \sigma = \frac{12.05 - 11.96}{\sqrt{12}} \approx 0.02598 \]Thus, the standard deviation is approximately 0.02598 ounces. This indicates a relatively tight distribution around the mean, suggesting that most cola cans will contain close to the mean volume of cola.
Probability Theory
Probability theory deals with quantifying uncertainty. In the context of a uniform distribution, it involves determining the likelihood that a variable falls within a specific range. The probabilities are always between 0 and 1, where 1 means certainty.

For the uniform distribution of cola cans, several probabilities can be calculated. The probability that a can has less than 12 ounces is found by:\[ P(X < 12) = \frac{12 - 11.96}{12.05 - 11.96} = \frac{0.04}{0.09} \approx 0.4444 \]Similarly, finding the probability that a can contains more than 11.98 ounces:\[ P(X > 11.98) = \frac{12.05 - 11.98}{12.05 - 11.96} = \frac{0.07}{0.09} \approx 0.7778 \]Probability theory allows us to make informed predictions based on known distributions, like knowing that certain amounts of cola are more or less likely than others.
Uniform Distribution Properties
A uniform distribution is a type of probability distribution in which all outcomes are equally likely. It is characterized by its 'rectangular' shape on a probability density function graph. This concept is foundational in statistics because it represents the simplest form of distribution.

The key features of a uniform distribution include:
  • Equally Likely Outcomes: Every outcome has the same probability.
  • Simple Descriptive Measures: Mean and standard deviation have straightforward, easily calculated formulas.
  • Defined Range: All possible values fall within a specific maximum and minimum; beyond this range, probabilities drop to zero.
For a uniform distribution of cola in cans, if we know the distribution is from 11.96 to 12.05 ounces, we know every amount within these bounds is equally probable. This simplicity allows for straightforward predictions and calculations related to the various quantities of cola found in different cans.

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Most popular questions from this chapter

A uniform distribution is defined over the interval from 2 to \(5 .\) a. What are the values for \(a\) and \(b\) ? b. What is the mean of this uniform distribution? c. What is the standard deviation? d. Show that the total area is 1.00 . e. Find the probability of a value more than 2.6 f. Find the probability of a value between 2.9 and 3.7 .

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