Aand b are two events.

p(a)=0.25 , p(b)=0.5 and p(a and b)=0.15 .

what is the value of p(a or b) ?

0.15

0.25

0.60

0.90

How much money does ron have left each month after his fixed expenses? ron graduated from college five years ago. he recently bought a house, but shares it with a housemate who pays him $800 a month for rent and utilities. ron is putting a budget worksheet together so he will have a better idea of where his money is going and where he can save. enlarge