13. Eighty percent of trees planted by a woodlands conservation group survive. What is the probabilitu that: a. a. 10 of the 12 trees just planted will survive? b. at least 10 of the trees just planted will survive? b.

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### Probability Problem on Tree Survival

**Problem Statement:**

Eighty percent of trees planted by a woodlands conservation group survive. What is the probability that:

**a.** 10 of the 12 trees just planted will survive?  
[Answer Box: a.]

**b.** At least 10 of the trees just planted will survive?  
[Answer Box: b.]

---

**Explanation:**

To solve this problem, you would typically use the binomial probability formula, as it is a problem dealing with success/failure outcomes.

The binomial probability formula is given by:  
\[ P(X = k) = \binom{n}{k} p^k (1-p)^{n-k} \]  
Where:  
- \( n \) is the number of trials (12 trees).
- \( k \) is the number of successful trials (e.g., 10 trees surviving).
- \( p \) is the probability of success on an individual trial (0.8 for this problem).
- \(\binom{n}{k}\) is the binomial coefficient.

**Calculation Steps:**

- **Part a:** Calculate \( P(X = 10) \).
- **Part b:** Calculate \( P(X \geq 10) = P(X = 10) + P(X = 11) + P(X = 12) \).

These calculations provide the required probabilities for each question.
Transcribed Image Text:### Probability Problem on Tree Survival **Problem Statement:** Eighty percent of trees planted by a woodlands conservation group survive. What is the probability that: **a.** 10 of the 12 trees just planted will survive? [Answer Box: a.] **b.** At least 10 of the trees just planted will survive? [Answer Box: b.] --- **Explanation:** To solve this problem, you would typically use the binomial probability formula, as it is a problem dealing with success/failure outcomes. The binomial probability formula is given by: \[ P(X = k) = \binom{n}{k} p^k (1-p)^{n-k} \] Where: - \( n \) is the number of trials (12 trees). - \( k \) is the number of successful trials (e.g., 10 trees surviving). - \( p \) is the probability of success on an individual trial (0.8 for this problem). - \(\binom{n}{k}\) is the binomial coefficient. **Calculation Steps:** - **Part a:** Calculate \( P(X = 10) \). - **Part b:** Calculate \( P(X \geq 10) = P(X = 10) + P(X = 11) + P(X = 12) \). These calculations provide the required probabilities for each question.
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