Height increase

Im a 18yr old college freshman, and since the start of spring semester ive grown 1 and 1/4 inches, and my arms have grown between a 1/4 and 1/2 and inch. But what I noticed was that rather than averaging 87-89mph fastball, I’m now averaging 88-90. I know its only 1mph, but its still alot when you haven’t done anything but run/ and rehab a dislocated kneecap the last 2 months. I also did tubing exercises to keep the shoulder strong, but didn’t seem like enough to boost fastball.

So, do you think that the height/arm length increase caused the increase?

P.S.— I was 6’4.5", now 6’5.5"

how do you average a range of numbers?

during last summer i grew like 7inches and gained 3 mph with really crappy mechs