Wizard needed to verify that im dong theese calcs right.

Let's assume 30k mtt hands. I wanna calculate the probability of bb/100 is < 2
bb/100 = 2
ev bb/100 = 8
stdv bb/100 = 70

Central limit theorem can be applied, right?

Is this formula correct? Should I use 30k/100 or just 30k?

t = (2-8) / (70/3k^0.5)

And then look up t in a z-table? (t will obv be very cloose to z coz of the large sample)