A container holding water shows that over a 4 week period a total of 3.86 cm had evaporated. Compute how much water on average had evaporated each week?

How do you find p(a and b) if a and b are independent events for two or more actions, such as tossing a coin twice and finding p(heads and heads)? 2. how do you find p(a or b) if a and b are independent events for one action, such as spinning a four-color spinner once and finding p(red or blue)?