How many positive 4-digit numbers are divisible by 5?
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- \text{Sum} = 2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20 = 110
- \text{Mean} = \frac{110}{10} = 11
- The arithmetic mean is \(\boxed{11}\).
- A 4-digit number ranges from 1000 to 9999. A number divisible by 5 ends in 0 or 5.
- Find the smallest and largest 4-digit numbers divisible by 5:
- Smallest: 1000 (divisible by 5)
