the president of State University wants to forecast student enrollments for this academic year based on the same historical data:

Year Enrollment

$5$ years ago $15,000$

$4$ years ago $16,000$

$3$ years ago $18,000$

$2$ years ago $20,000$

Last year $21,000$

What is the forecast for this year using a four$-$year simple moving average?

Question $6$ options:

$18,750$

$19,500$

$21,000$

$22,000$

$22,800$