To calculate this probability is often easier to calculate the complement the prob that we are looking for is 1-P(No salt packed in dinner) Note: No salt packed with dinner is the complement event of having salt packed within so let's find this probability He is what we know if John packs 4/45 chance no salt included if Sue packs 3/70 chance no salt if Marry packs 2/25 No salt We are looking into probability is the sum (note these events are disjoint) final result should be 1- that sum
Slope of a horizontal line. When two points have the same y-value, it means they lie on a horizontal line. The slope of such a line is 0, and you will also find this by using the slope formula.
