# STA 205 Study Guide - Quiz Guide: Standard Deviation, Jutes, Lunar Reconnaissance Orbiter

## Document Summary

Suppose that monthly cell phone bills are normally distributed with a mean of . 20 and a standard deviation of. Use the empirical rule to answer parts a - b: Th is monthly bill is _j / j~ standard deviations atx)je the mean. (3 points: an at&t subscriber"s monthly bill was 1. 21 standard deviations above the mean. \ 0 (2 points: (net. com posted an on line survey investigating cell phone data usage. They received a total of 1,012 responses to the survey. Each person was asked to report their age and whether or not they reached their data limit in the previous month. Identify the type of sample which was used to gather the collected data. (2 pts) Identify the two variables recorded and classify them as categorical or quantitative. (4 pts) Variable 1: __ _ ;_ ; ; - - " - - - - " -=~ - -=: : - - - -