Does anyone know the simulation to this?

the weather report shows that there is a 33 1/3% chance of rain.

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

Find cot x if sin x cot x csc x = √2

Which equation is y = -6x2 + 3x + 2 rewritten in vertex form?