College Math Lesson 4.4 - Standard Deviation

Objective: At the end of this lesson, students will be able to calculate the standard deviation of a data set Vocabulary: Standard deviation – Deviations from the mean – Calculating the Standard Deviation Range rule of thumb – Example: Customers at Big Bank can enter any one of three different lines leading to three different tellers. Best Bank also has three tellers, but all customers wait in a single line and are called to the next available teller. The following values are waiting times, in minutes, for eleven customers at each bank. Calculate the mean and standard deviation for each data set. Big Bank (three lines): 4.1 5.2 5.6 6.2 6.7 7.2 7.7 7.7 8.5 9.3 11.0 Best Bank (one line): 6.6 6.7 6.7 6.9 7.1 7.2 7.3 7.4 7.7 7.8 7.8