A die is thrown `20` times. Getting a number greater than `4` is considered a success. Find the mean and variance of the number of successes.

Explanation

To solve the problem, we need to find the mean and variance of the number of successes when a die is thrown 20 times, and a success is defined as rolling a number greater than 4.

### Step-by-Step Solution:

1. **Identify the Total Number of Trials (n)**:
- The die is thrown 20 times, so \( n = 20 \).

2. **Determine the Probability of Success (p)**:
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