book Maths Puzzle Numerical Ability

Cindy's is to check computer printer for defects. Out of 420 printers she has to check,only 3 of the frist 84 have been defective. Using this information, what is the best predicti

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book Other Question

A golfer hits a golf ball and its height in feet is represented by
h=-16t^2 + 140t +3 (t in seconds)

How high does the golfball go and when does it hit the ground? If A and B are mutually exclusive events and P(A) = 0.3 and P(B) =0.2 find the following: a. P(A and B) do i just do .2+.3=.5 or is that wrong? i have no idea! and also b. P(A orB) is that just to divide or subtract? i am so... confused :/