Over the summer, you read 20 books. Eight of these books were biographies. a. find the ratio of biographies to the total number of books.
b. find the ratio of non-biographies to biographies
c. find the ratio of non-biographies to the total of the number of books.

Joel wants to buy a new tablet computer fram a store having a 20% off sale on all tablets. the tablet he wants has an original cost of $190. he also wants to make sure he has enough money to pay the 5% sales tax. part one joel uses the incorect expression 0.95(190)(0.8) to calculate that the tablet will cost him a total of $144.40. describe his error and write the correct expression part two how much will joel pay for the tablet show your work if you answer this question correctly you will receive a prize of 99 points good luck

Either enter an exact answer in terms of \piπ or use 3.143.14 for \piπ and enter your answer as a decimal.

Compute the standard deviation of the following set of data to the nearest whole number. 10, 10, 15, 20, 25