There's basic "stat" for the social sciences (nothing but arithmetic for means, medians, standard deviation, and so forth). Then there's calculus-based probability, which can be very rigorous. The CS curriculum at rigorous programs tends to require the harder, calculus-based probability. I was a math major, but there were a lot of CS and engineering students in my stats class.
BTW, even with the calculus prereq, I'd agree that linear algebra would typically be a harder class, so I definitely understand why you're surprised someone would pass Linear Algebra and fail Stats.
BTW, even with the calculus prereq, I'd agree that linear algebra would typically be a harder class, so I definitely understand why you're surprised someone would pass Linear Algebra and fail Stats.