Which of the choices is the standard deviation of the sample shown here? 19,20,21,22,23

Acoin bank containing only dimes and quarters has 12 more dimes than quarters. the total value of the coins is $11. how many quarters and dimes are in the coin bank?

Anew shopping mall is gaining in popularity. every day since it opened, the number of shoppers is 5% more than the number of shoppers the day before. the total number of shoppers over the first 10 days is 1258 how many shoppers were on the first day?

1. how do you convert the repeating, nonterminating decimal 0. to a fraction? explain the process as you solve the problem.