Student Probabilities
1. **State the problem:**
We have a table showing the distribution of students by gender and major with some missing probabilities. We need to complete the table and find certain probabilities.
2. **Complete the table:**
Given probabilities:
- Male Agri (M,A) = 0.10
- Male Bio (M,B) = 0.24
- Male Education (M,E) = 0.14
- Female Bio (F,B) = 0.29
- Female Education (F,E) = 0.17
Let the missing probability Female Agri (F,A) = $x$.
Since total probability must sum to 1:
$$0.10 + 0.24 + 0.14 + x + 0.29 + 0.17 = 1$$
$$0.94 + x = 1$$
$$x = 1 - 0.94 = 0.06$$
So, Female Agri (F,A) = 0.06.
3. **Calculate required probabilities:**
(i) Probability student is an Education major:
$$P(E) = P(M,E) + P(F,E) = 0.14 + 0.17 = 0.31$$
(ii) Probability student is male or an Agri major:
Use formula for union:
$$P(M \cup A) = P(M) + P(A) - P(M \cap A)$$
Calculate each:
$$P(M) = 0.10 + 0.24 + 0.14 = 0.48$$
$$P(A) = 0.10 + 0.06 = 0.16$$
$$P(M \cap A) = 0.10$$
So:
$$P(M \cup A) = 0.48 + 0.16 - 0.10 = 0.54$$
(iii) Probability student is female given Education major:
Conditional probability formula:
$$P(F|E) = \frac{P(F \cap E)}{P(E)} = \frac{0.17}{0.31} \approx 0.55$$
4. **Check independence of events "Female" and "Bio Major":**
Events are independent if:
$$P(F \cap B) = P(F) \times P(B)$$
Calculate:
$$P(F) = 0.06 + 0.29 + 0.17 = 0.52$$
$$P(B) = 0.24 + 0.29 = 0.53$$
$$P(F \cap B) = 0.29$$
Calculate product:
$$P(F) \times P(B) = 0.52 \times 0.53 = 0.2756$$
Since $$0.29 \neq 0.2756$$, the events are **not independent**.
**Final answers:**
- Missing probability Female Agri = 0.06
- (i) $P(E) = 0.31$
- (ii) $P(M \cup A) = 0.54$
- (iii) $P(F|E) \approx 0.55$
- Events "Female" and "Bio Major" are not independent.