# Excel Decision Support System/Math

Anonymous
timer Asked: Jun 29th, 2018
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Question description

A metropolitan school system consists of three districts—north, south, and central. The north dis- trict contains 25% of all students, the south district contains 40%, and the central district contains 35%. A minimum-competency test was given to all students; 10% of the north district students failed, 15% of the south district students failed, and 5% of the central district students failed.

a. Develop a probability tree showing all marginal, conditional, and joint probabilities.

b. Develop a joint probability table.

c. What is the probability that a student selected at random failed the test?

## Tutor Answer

jesusale932
School: UIUC

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Anonymous
Awesome! Exactly what I wanted.

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