Moving avg of 30 days preceding the board meeting thats closest to your start date. Eg - Board meeting is on 02/01 and you start on 02/05, then your strike price is the average stock price from 01/01 to 02/01 This is mentioned in the offer letter
do they calculate it on every vesting?
RSU count is determined before every award, you vest the count you were awarded.
Moving average of 45 days I guess