Math Problem Statement

Major league baseball game durations are normally distributed with a mean of 190 minutes and a standard deviation of 35 minutes.

What is the probability of a game duration of between 210 and 220 minutes?

Please specify your answer in decimal terms and round your answer to the nearest hundredth (e.g., enter 12 percent as 0.12).

Solution

To find the probability of a Major League Baseball game lasting between 210 and 220 minutes, we can use the properties of the normal distribution. Here's the process:

  1. Convert the values to z-scores: The formula for converting a raw score xx to a z-score is: z=xμσz = \frac{x - \mu}{\sigma} where:

    • μ=190\mu = 190 (mean game duration)
    • σ=35\sigma = 35 (standard deviation)

    For 210 minutes: z1=21019035=20350.57z_1 = \frac{210 - 190}{35} = \frac{20}{35} \approx 0.57

    For 220 minutes: z2=22019035=30350.86z_2 = \frac{220 - 190}{35} = \frac{30}{35} \approx 0.86

  2. Find the probabilities corresponding to these z-scores: Using standard normal distribution tables or a calculator:

    • The probability for z1=0.57z_1 = 0.57 is approximately 0.7157.
    • The probability for z2=0.86z_2 = 0.86 is approximately 0.8051.
  3. Calculate the probability between 210 and 220 minutes: The probability is the difference between the two probabilities: P(210X220)=P(z2)P(z1)=0.80510.7157=0.0894P(210 \leq X \leq 220) = P(z_2) - P(z_1) = 0.8051 - 0.7157 = 0.0894

So, the probability of a game lasting between 210 and 220 minutes is approximately 0.09.


Would you like further clarification, or have any questions?

Here are 5 related questions you might consider:

  1. What is the probability of a game lasting more than 220 minutes?
  2. How would the probability change if the mean game duration increased to 200 minutes?
  3. What is the z-score for a game that lasts exactly 190 minutes?
  4. How would you calculate the probability of a game lasting less than 210 minutes?
  5. What is the area under the normal distribution curve for a game lasting exactly 190 minutes?

Tip: Always double-check your z-scores using a standard normal distribution table or calculator for precision.

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Math Problem Analysis

Mathematical Concepts

Probability
Normal Distribution
Z-scores

Formulas

Z-score formula: z = (x - μ) / σ
Probability calculation for a range in a normal distribution: P(a ≤ X ≤ b) = P(z2) - P(z1)

Theorems

Empirical Rule for Normal Distribution

Suitable Grade Level

Grades 10-12