throwing a six

looking initially at how many sixes you obtain when a dice is rolled 20 times

a ppt is here

"how many sixes do you think would be obtained normally?"
















class results can be amalgamated to compare a short run (one student, 20 throws) with a longer run: the number in the class lots of 20

then exploring simpler cases, theoretically
what is the probability of getting exactly
0 sixes?
1 six?
what is the probability of getting more than 1 six?

why are these the same?