Math Problem Statement

Use the contingency table to complete parts​ a) through​ d) below. Event A Event B

Event C 8 6 Event D 3 13 Event E 15 5 Question content area bottom Part 1 ​a) Determine the probability of Upper P left parenthesis A|C right parenthesis. Upper P left parenthesis A|C right parenthesisequals    0.57 ​(Round to two decimal places as​ needed.) Part 2 ​b) Determine the probability of Upper P left parenthesis C|A right parenthesis. Upper P left parenthesis C|A right parenthesisequals    0.31 ​(Round to two decimal places as​ needed.) Part 3 ​c) Determine the probability of Upper P left parenthesis B|E right parenthesis. Upper P left parenthesis B|E right parenthesisequals    0.20

Solution

To solve these questions, we'll use the conditional probability formula:

P(AC)=P(AC)P(C)P(A|C) = \frac{P(A \cap C)}{P(C)}

P(CA)=P(AC)P(A)P(C|A) = \frac{P(A \cap C)}{P(A)}

P(BE)=P(BE)P(E)P(B|E) = \frac{P(B \cap E)}{P(E)}

Step-by-Step Solution:

a) P(AC)P(A|C)

From the table:

  • The frequency of AC=8A \cap C = 8
  • The total frequency of C=8+6=14C = 8 + 6 = 14

P(AC)=814=0.57P(A|C) = \frac{8}{14} = 0.57


b) P(CA)P(C|A)

From the table:

  • The frequency of AC=8A \cap C = 8
  • The total frequency of A=8+3+15=26A = 8 + 3 + 15 = 26

P(CA)=8260.31P(C|A) = \frac{8}{26} \approx 0.31


c) P(BE)P(B|E)

From the table:

  • The frequency of BE=5B \cap E = 5
  • The total frequency of E=15+5=20E = 15 + 5 = 20

P(BE)=520=0.20P(B|E) = \frac{5}{20} = 0.20

Final Results:

  1. P(AC)=0.57P(A|C) = 0.57
  2. P(CA)=0.31P(C|A) = 0.31
  3. P(BE)=0.20P(B|E) = 0.20

If you have any questions or need further clarification, let me know!

Here are 5 related questions you might consider:

  1. How would the probabilities change if the values in the table were adjusted?
  2. Can you derive a general formula for conditional probabilities?
  3. What is the complement of P(AC)P(A|C)?
  4. How does the law of total probability apply to contingency tables?
  5. What happens if you calculate P(CE)P(C|E)?

Tip: Always double-check the total frequencies when calculating probabilities from a contingency table to avoid errors.

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Math Problem Analysis

Mathematical Concepts

Conditional Probability
Contingency Tables
Probability

Formulas

P(A|C) = P(A ∩ C) / P(C)
P(C|A) = P(A ∩ C) / P(A)
P(B|E) = P(B ∩ E) / P(E)

Theorems

Law of Conditional Probability

Suitable Grade Level

Grades 9-12