If Mr. Bisby wants to know the average of the grades on a test, what measure of central tendency would he be looking at? (Spelling counts so make sure to spell it correctly)

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)?