Question 6.13. If P(X < c[Y = 4) = 2/3, what is c? a. 6 b. 7 С. 8 d. 9

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**Transcription of Text for Educational Website**

---

**Probability and Random Variables with Dice**

*Use the following information for the next 4 questions.*

Suppose that a pair of dice is rolled, and let \( X \) be the sum of the two numbers from each dice. Let's also define an additional random variable, \( Y \), as the number from the first dice (we can figure out which one is the first dice).

**Question 6.10**: Which of the following is equal to \( P(X \leq 6) - P(X \leq 4) \)?

- a. \( P(6 \leq X \leq 7) \)
- b. \( P(7 \leq X \leq 9) \)
- c. \( P(9 \leq X \leq 10) \)
- d. \( P(9 \leq X \leq 11) \)

**Question 9**: What is \( P(1 < X \leq 4) \)?

- a. .3125
- b. .635
- c. .9375

The correct answer is circled as option c, .9375.

---

**Explanation**

The questions involve determining probabilities related to the sum of two dice rolls. A pair of six-sided dice results in potential sums ranging from 2 to 12. The calculations generally involve understanding probability distributions and cumulative probabilities for these sums.
Transcribed Image Text:**Transcription of Text for Educational Website** --- **Probability and Random Variables with Dice** *Use the following information for the next 4 questions.* Suppose that a pair of dice is rolled, and let \( X \) be the sum of the two numbers from each dice. Let's also define an additional random variable, \( Y \), as the number from the first dice (we can figure out which one is the first dice). **Question 6.10**: Which of the following is equal to \( P(X \leq 6) - P(X \leq 4) \)? - a. \( P(6 \leq X \leq 7) \) - b. \( P(7 \leq X \leq 9) \) - c. \( P(9 \leq X \leq 10) \) - d. \( P(9 \leq X \leq 11) \) **Question 9**: What is \( P(1 < X \leq 4) \)? - a. .3125 - b. .635 - c. .9375 The correct answer is circled as option c, .9375. --- **Explanation** The questions involve determining probabilities related to the sum of two dice rolls. A pair of six-sided dice results in potential sums ranging from 2 to 12. The calculations generally involve understanding probability distributions and cumulative probabilities for these sums.
**Question 6.11.** If \( P(X \geq b) = \frac{1}{6} \) and \( P(a \leq X < b) = \frac{5}{12} \), what is \( a + b \)?

a. 16  
b. 17  
c. 18  
d. 19  

_Selected Answer: b. 17_

---

**Question 6.12.** What is \( P(X \geq 10 | Y = 6) \)?

a. \( \frac{1}{12} \)  
b. \( \frac{1}{4} \)  
c. \( \frac{1}{3} \)  
d. \( \frac{1}{2} \)  

_Selected Answer: d. \(\frac{1}{2}\)_

---

**Question 6.13.** If \( P(X \leq c | Y = 4) = \frac{2}{3} \), what is \( c \)?

a. 6  
b. 7  
c. 8  
d. 9  

_Selected Answer: d. 9_

---

**Use the following information for the next 3 questions:** 

Suppose we have a continuous random variable \( X \).

- \( P(1 \leq X \leq 2) = 0.2 \)
- \( P(2 \leq X \leq 4) = 0.6 \)
- \( P(1 \leq X \leq 3) = 0.5 \)
- \( P(3 \leq X \leq 6) = 0.5 \)

---

**Question 6.14.** What is \( P(2 \leq X \leq 3) \)?

a. 0.1  
b. 0.2  
c. 0.3  
d. 0.4  

*(Options for the answer were not circled or specified.)*
Transcribed Image Text:**Question 6.11.** If \( P(X \geq b) = \frac{1}{6} \) and \( P(a \leq X < b) = \frac{5}{12} \), what is \( a + b \)? a. 16 b. 17 c. 18 d. 19 _Selected Answer: b. 17_ --- **Question 6.12.** What is \( P(X \geq 10 | Y = 6) \)? a. \( \frac{1}{12} \) b. \( \frac{1}{4} \) c. \( \frac{1}{3} \) d. \( \frac{1}{2} \) _Selected Answer: d. \(\frac{1}{2}\)_ --- **Question 6.13.** If \( P(X \leq c | Y = 4) = \frac{2}{3} \), what is \( c \)? a. 6 b. 7 c. 8 d. 9 _Selected Answer: d. 9_ --- **Use the following information for the next 3 questions:** Suppose we have a continuous random variable \( X \). - \( P(1 \leq X \leq 2) = 0.2 \) - \( P(2 \leq X \leq 4) = 0.6 \) - \( P(1 \leq X \leq 3) = 0.5 \) - \( P(3 \leq X \leq 6) = 0.5 \) --- **Question 6.14.** What is \( P(2 \leq X \leq 3) \)? a. 0.1 b. 0.2 c. 0.3 d. 0.4 *(Options for the answer were not circled or specified.)*
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