Chapter P, Problem 2E

Exercises

You can use the following problems as a self-test on the material presented in this review. If you can handle these problems, you’re ready to do all of the arithmetic in this text. If you have difficulty with any of these problems, please review the appropriate section of this prologue. You might also want to use this section as an opportunity to become more familiar with your calculator. The answers are given immediately following these exercises, along with commentary and some reminders.

For the set of scores $(X_i)$ of 50, 55, 60, 65, and 70, evaluate each of the following expressions:

${\displaystyle \sum X_i}=$

${\displaystyle \sum X_i^2}=$

${\left({\displaystyle \sum X_i}\right)}^2=$