The sample variance a. can never be zero. b. is always smaller than the true value of the population variance. c. is always larger than the true value of the population variance. d. could be smaller, equal to, or larger than the true value of the population variance.

pay attention in your classes and concentrate the best thing you can do to raise your test scores is to pay attention when you're supposed to be learning the material: in class!

take good notes.

do your homework.

use mnemonics and other tricks.

do practice tests.

note: the best i know.

the answer is:

mean: 6

mad: 2.14

well if he bought them at 5 cedis each sold them at 7 cedis each then he would make a profit of 2 cedis of each book. if in total he made 150 cedis profit that means he sold 75 books. he lost 12 books at the start so that means he originally bought a total of 82 books.

step-by-step explanation: