Most schools have post-graduation survey. Quick google shows mit's 2020 class had 70 bachelor students responding to the survey for jobs in the tech industry, with base salary of:

$97,750, $118,000 $129,000 for 25th, 50th, and 75th percentile respectively

IIRC this number is typically just the base salary so you can roughly double it to include bonus and stock.

Click Employment tab then Page 9 in https://capd.mit.edu/resources/student-outcomes-and-salaries