Suppose $x$ is a random real number between $1$ and $4$, and $y$ is a random real number between $1$ and $9$. If the expected value of \[ \left\lceil \log_2 x \right\rceil - \left\lfloor \log_3 y \right\rfloor \] can be expressed as $\frac mn$ where $m$ and $n$ are relatively prime positive integers, compute $100m + n$.

[i]Proposed by Lewis Chen[/i]
1. **Define the variables and expressions:**
   Let \( x \) be a random real number between 1 and 4, and \( y \) be a random real number between 1 and 9. We need to find the expected value of \( \left\lceil \log_2 x \right\rceil - \left\lfloor \log_3 y \right\rfloor \).

2. **Analyze \( \left\lceil \log_2 x \right\rceil \):**
   - For \( x \) in the interval \([1, 2)\), \( \log_2 x \) ranges from 0 to 1. Thus, \( \left\lceil \log_2 x \right\rceil = 1 \).
   - For \( x \) in the interval \([2, 4)\), \( \log_2 x \) ranges from 1 to 2. Thus, \( \left\lceil \log_2 x \right\rceil = 2 \).

   Since \( x \) is uniformly distributed between 1 and 4:
   - The probability that \( x \) is in \([1, 2)\) is \( \frac{1}{3} \).
   - The probability that \( x \) is in \([2, 4)\) is \( \frac{2}{3} \).

   Therefore, the expected value of \( \left\lceil \log_2 x \right\rceil \) is:
   \[
   E(\left\lceil \log_2 x \right\rceil) = \frac{1}{3} \cdot 1 + \frac{2}{3} \cdot 2 = \frac{1}{3} + \frac{4}{3} = \frac{5}{3}
   \]

3. **Analyze \( \left\lfloor \log_3 y \right\rfloor \):**
   - For \( y \) in the interval \([1, 3)\), \( \log_3 y \) ranges from 0 to 1. Thus, \( \left\lfloor \log_3 y \right\rfloor = 0 \).
   - For \( y \) in the interval \([3, 9)\), \( \log_3 y \) ranges from 1 to 2. Thus, \( \left\lfloor \log_3 y \right\rfloor = 1 \).

   Since \( y \) is uniformly distributed between 1 and 9:
   - The probability that \( y \) is in \([1, 3)\) is \( \frac{2}{8} = \frac{1}{4} \).
   - The probability that \( y \) is in \([3, 9)\) is \( \frac{6}{8} = \frac{3}{4} \).

   Therefore, the expected value of \( \left\lfloor \log_3 y \right\rfloor \) is:
   \[
   E(\left\lfloor \log_3 y \right\rfloor) = \frac{1}{4} \cdot 0 + \frac{3}{4} \cdot 1 = 0 + \frac{3}{4} = \frac{3}{4}
   \]

4. **Calculate the expected value of the expression:**
   \[
   E\left( \left\lceil \log_2 x \right\rceil - \left\lfloor \log_3 y \right\rfloor \right) = E(\left\lceil \log_2 x \right\rceil) - E(\left\lfloor \log_3 y \right\rfloor) = \frac{5}{3} - \frac{3}{4}
   \]

5. **Simplify the expression:**
   \[
   \frac{5}{3} - \frac{3}{4} = \frac{20}{12} - \frac{9}{12} = \frac{11}{12}
   \]

6. **Express the result in the form \( \frac{m}{n} \) where \( m \) and \( n \) are relatively prime:**
   Here, \( m = 11 \) and \( n = 12 \).

7. **Compute \( 100m + n \):**
   \[
   100m + n = 100 \cdot 11 + 12 = 1100 + 12 = 1112
   \]

The final answer is \( \boxed{1112} \).