Question 4

1. The integers in the specified range are between $2$ and $198$.

2. The multiples of $10$ in this range are:

   $$\{10, 20, 30, \dots, 190\}.$$

3. This sequence forms an arithmetic progression where:

   • First term $a = 10$
   • Last term $l = 190$
   • Common difference $d = 10$
   • Number of terms $n = \frac{190 - 10}{10} + 1 = 19$

4. For any finite arithmetic progression, the average equals the average of the first and last terms:

   $$\text{Average} = \frac{a + l}{2} = \frac{10 + 190}{2} = \frac{200}{2} = 100.$$

This corresponds to option B.