Explanation:The first thing you can do is estimate the answer. 2 teachers earn $16,000, 3 teachers earn $17,000, and 5 teachers earn $18,000. If 2 teachers earn $16,000 and 2 teachers earn $18,000, the average is $17,000. That leaves 3 teachers earning $17,000 and 3 teachers earning $18,000. Therefore the average of these teachers would be $17,500. So we estimate that the average salary will be a little more than $17,000.
Solution: 2*$16,000=$32,000, 3*$17,000=$51,000, and 5*$18,000=$90,000
$32,000+$51,000+$90,000=$173,000
divide $173,000 by 10 because there are 10 teachers
$173,000/10=$17,300 average salary, and we estimated a little more than $17,000
answer: $17,300 average salary