Math Problem Statement

Assume that the readings at freezing on a bundle of thermometers are normally distributed with a mean of 0°C and a standard deviation of 1.00°C. A single thermometer is randomly selected and tested. Find the probability of obtaining a reading less than -0.094°C.

Solution

To find the probability P(Z<0.094)P(Z < -0.094), we need to use the standard normal distribution.

Given:

  • The thermometer readings are normally distributed with a mean μ=0\mu = 0 and a standard deviation σ=1\sigma = 1.
  • We are looking for P(Z<0.094)P(Z < -0.094).

Since ZZ represents the standard normal variable, we can directly use the z-score value of 0.094-0.094 to look up the cumulative probability in the standard normal distribution table or use a calculator.

  1. Using the standard normal distribution table or a calculator: For Z=0.094Z = -0.094:
    • The cumulative probability P(Z<0.094)0.463P(Z < -0.094) \approx 0.463.

Therefore: P(Z<0.094)0.463P(Z < -0.094) \approx 0.463

This means there is approximately a 46.3% chance of obtaining a reading less than 0.094C-0.094^\circ C.

Would you like more details on how to interpret this probability?


Here are 5 related questions that could deepen your understanding:

  1. How would the probability change if the reading threshold was different, say 0.5-0.5 or 0.10.1?
  2. What is the probability of obtaining a reading between two values, for example, between 0.1-0.1 and 0.20.2?
  3. How would this problem change if the standard deviation was 0.5 instead of 1.0?
  4. What is the probability of obtaining a reading greater than 0.094-0.094?
  5. Can you explain why the normal distribution is appropriate for this type of problem?

Tip: When interpreting probabilities in a standard normal distribution, values close to 0.5 mean the value is near the mean, while probabilities closer to 0 or 1 indicate values far from the mean in the respective directions.

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Math Problem Analysis

Mathematical Concepts

Probability
Normal Distribution
Standard Normal Distribution
Z-scores

Formulas

Z = (X - μ) / σ

Theorems

68-95-99.7 rule (Empirical Rule)
Properties of Standard Normal Distribution

Suitable Grade Level

Grades 10-12