/sci/ - Science & Math

>>15085518
Guy from /tg/ doing some tabletop statistics spreadsheet math. I think I have this right, I just want somebody that actually knows to double check me.
I'm trying to figure out the average number of positive results over a number of instances.

So let's say you have a 6 sided die, and you roll it 5 times.

If you want to know the probability that ANY of them are 2 or less you'd do 1-(1-.33)^5= 0.8649

BUT If I wanted to know the average number of rolls of 2 or less over 5 rolls, I just multiply .66*5= 3.3, right?
A coin (50%) flipped 8 times gets an average of 4 heads, so I feel like this is right. But every time I think I have this stuff understood I end up having to learn another equation.