Answered: Mr Javier, a bank manager is interested…

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.5: Comparing Sets Of Data

Problem 26PFA

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Question

Mr Javier, a bank manager is interested in the amount of time it takes his teller to service depositors. On a particular morning, he asked his secretary to record the service time for 15 costumers. The times are given below. (to the nearest minutes).

6, 9, 7, 5, 15, 10, 9, 7, 4, 9, 10, 9, 8, 6, 7

Find:

a.) mean service time

b.) Median

c.) lower quartile(Q1)

d.) Upper quartile(Q3)

Definition Definition Middle value of a data set. The median divides a data set into two halves, and it also called the 50th percentile. The median is much less affected by outliers and skewed data than the mean. If the number of elements in a dataset is odd, then the middlemost element of the data arranged in ascending or descending order is the median. If the number of elements in the dataset is even, the average of the two central elements of the arranged data is the median of the set. For example, if a dataset has five items—12, 13, 21, 27, 31—the median is the third item in ascending order, or 21. If a dataset has six items—12, 13, 21, 27, 31, 33—the median is the average of the third (21) and fourth (27) items. It is calculated as follows: (21 + 27) / 2 = 24.

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