According to a recent report, people smile an average of µ = 62 times per day. assuming that the distribution of smiles is approximately normal with a standard deviation of σ = 18, find each of the following values: a. what proportion of people smile more than 80 times a day

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Can someone me out here and the tell me the greatest common factor

Many newspapers carry a certain puzzle in which the reader must unscramble letters to form words. how many ways can the letters of emdangl be arranged? identify the correct unscrambling, then determine the probability of getting that result by randomly selecting one arrangement of the given letters.