Andrew flips a fair coin $5$ times, and counts the number of heads that appear. Beth flips a fair coin $6$ times and also counts the number of heads that appear. Compute the probability Andrew counts at least as many heads as Beth.
To solve this problem, we need to compute the probability that Andrew counts at least as many heads as Beth when they flip their coins. Let's denote the number of heads Andrew gets as \(X\) and the number of heads Beth gets as \(Y\). We are interested in finding \(P(X \geq Y)\).

1. **Define the distributions:**
   - Andrew flips a fair coin 5 times. The number of heads \(X\) follows a binomial distribution with parameters \(n = 5\) and \(p = 0.5\):
     \[
     X \sim \text{Binomial}(5, 0.5)
     \]
   - Beth flips a fair coin 6 times. The number of heads \(Y\) follows a binomial distribution with parameters \(n = 6\) and \(p = 0.5\):
     \[
     Y \sim \text{Binomial}(6, 0.5)
     \]

2. **Calculate the probability mass functions:**
   - The probability mass function for \(X\) is:
     \[
     P(X = k) = \binom{5}{k} \left(0.5\right)^5 \quad \text{for } k = 0, 1, 2, 3, 4, 5
     \]
   - The probability mass function for \(Y\) is:
     \[
     P(Y = k) = \binom{6}{k} \left(0.5\right)^6 \quad \text{for } k = 0, 1, 2, 3, 4, 5, 6
     \]

3. **Compute the joint probability:**
   - We need to find \(P(X \geq Y)\). This can be computed by summing the joint probabilities where \(X \geq Y\):
     \[
     P(X \geq Y) = \sum_{i=0}^{5} \sum_{j=0}^{i} P(X = i) P(Y = j)
     \]

4. **Calculate the individual probabilities:**
   - For \(X = i\):
     \[
     P(X = i) = \binom{5}{i} \left(0.5\right)^5
     \]
   - For \(Y = j\):
     \[
     P(Y = j) = \binom{6}{j} \left(0.5\right)^6
     \]

5. **Sum the probabilities:**
   - We need to sum the probabilities for all valid combinations where \(X \geq Y\):
     \[
     P(X \geq Y) = \sum_{i=0}^{5} \sum_{j=0}^{i} \binom{5}{i} \left(0.5\right)^5 \binom{6}{j} \left(0.5\right)^6
     \]

6. **Simplify the expression:**
   - Notice that \(\left(0.5\right)^{11}\) is a common factor:
     \[
     P(X \geq Y) = \left(0.5\right)^{11} \sum_{i=0}^{5} \sum_{j=0}^{i} \binom{5}{i} \binom{6}{j}
     \]

7. **Evaluate the sums:**
   - This step involves evaluating the double sum, which can be done using combinatorial arguments or computational tools. However, it is known from symmetry and combinatorial arguments that the probability \(P(X \geq Y)\) for this specific problem is \(0.5\).

The final answer is \(\boxed{0.5}\).