Math Problem Statement

Suppose a brewery has a filling machine that fills 12 ounce bottles of beer. It is known that the amount of beer poured by this filling machine follows a normal distribution with a mean of 12.27 ounces and a standard deviation of 0.06 ounce. Find the probability that the bottle contains between 12.17 and 12.23 ounces.

0.8351

0.20.47

0.8475

0.1649

Solution

To find the probability that a bottle contains between 12.17 and 12.23 ounces, we will use the properties of the normal distribution. Given:

  • Mean (μ\mu) = 12.27 ounces
  • Standard deviation (σ\sigma) = 0.06 ounces

We need to find the probability P(12.17X12.23)P(12.17 \leq X \leq 12.23).

  1. Convert the values 12.17 and 12.23 to their corresponding z-scores using the formula:

z=Xμσz = \frac{X - \mu}{\sigma}

For X=12.17X = 12.17:

z1=12.1712.270.06=0.100.06=1.67z_1 = \frac{12.17 - 12.27}{0.06} = \frac{-0.10}{0.06} = -1.67

For X=12.23X = 12.23:

z2=12.2312.270.06=0.040.06=0.67z_2 = \frac{12.23 - 12.27}{0.06} = \frac{-0.04}{0.06} = -0.67

  1. Use the standard normal distribution table (or a calculator) to find the probabilities corresponding to these z-scores.

For z=1.67z = -1.67:

P(Z1.67)=0.0475P(Z \leq -1.67) = 0.0475

For z=0.67z = -0.67:

P(Z0.67)=0.2514P(Z \leq -0.67) = 0.2514

  1. The probability that the bottle contains between 12.17 and 12.23 ounces is the difference between these probabilities:

P(12.17X12.23)=P(Z0.67)P(Z1.67)=0.25140.0475=0.2039P(12.17 \leq X \leq 12.23) = P(Z \leq -0.67) - P(Z \leq -1.67) = 0.2514 - 0.0475 = 0.2039

Therefore, the correct answer is:

0.2039\boxed{0.2039}

Would you like more details or have any questions?

Here are 5 numbered questions for you to ask:

  1. How do you find z-scores for a given data set?
  2. What is the significance of the standard normal distribution table?
  3. How do you calculate probabilities for non-standard normal distributions?
  4. What are some real-world applications of normal distribution?
  5. How does changing the mean or standard deviation affect the normal distribution?

Tip: When dealing with normal distributions, always remember to convert raw scores to z-scores to utilize the standard normal distribution table effectively.

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Math Problem Analysis

Mathematical Concepts

Normal Distribution
Z-score

Formulas

Z-score formula: z = (X - μ) / σ

Theorems

Properties of Normal Distribution

Suitable Grade Level

College Level