Test the claim about the difference between two population means mu 1μ1 and mu 2μ2 at the level of significance alphaα. assume the samples are random and independent, and the populations are normally distributed

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)?