Math Problem Statement
Solution
The problem presented asks us to determine a travel time, , such that 29.46% of the travel times exceed this value, given that Abby's travel times are normally distributed with a mean of 35.6 minutes and a standard deviation of 10.3 minutes.
This is a standard normal distribution problem. We need to find the value of for which 29.46% of the distribution is greater than . In terms of a z-score, this means we're looking for the z-value where the upper tail of the standard normal distribution is 29.46%.
Steps:
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Convert the percentage to a probability:
29.46% translates to a probability of 0.2946. This is the area to the right of , so we are looking for a z-score where the area to the right is 0.2946, or equivalently, the area to the left is . -
Find the z-score corresponding to the cumulative probability of 0.7054 using standard normal tables or a calculator.
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Use the z-score formula:
where (mean) and (standard deviation). Solve for once the z-score is known.
Let me calculate the z-score and the corresponding .
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Math Problem Analysis
Mathematical Concepts
Normal Distribution
Probability
Z-score
Formulas
z = (x - μ) / σ
Theorems
Empirical Rule
Properties of Normal Distribution
Suitable Grade Level
College-level Statistics
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