Engineering Fundamentals: An Introduction to Engineering, 4th ed.c

15.2 Using MATLAB Built-in Functions 473

TABLE 15.9 Data for Example 14.4 (Revisited)

Group-A Findings Group-B Findings

r(kg /m

3

) r(kg /m

3

)

1020 950

1015 940

990 890

1060 1080

1030 1120

950 900

975 1040

1020 1150

980 910

960 1020

Example 14.4 Using MATLAB, compute the average (arithmetic mean) and the standard deviation of the

(Revisited) density of water data given in Table 15.9. Refer to Chapter 19, Section 19.4, to learn about what

the value of the standard deviation for a set of data points represents.

The final results for Example 14.4 (Revisited) are shown in Figure 15.6. The MATLAB

commands leading to these results are:

>>Density_A = [1020 1015 990 1060 1030 950 975 1020 980 960];

>>Density_B = [950 940 890 1080 1120 900 1040 1150 910 1020];

>> Density_A_Average = mean(Density_A)

Density_A_Average =

1000.00

>> Density_B_Average = mean(Density_B)

Density_B_Average =

1000.00

>> Standard_Deviation_For_Group_A = std(Density_A)

Standard_Deviation_For_Group_A =

34.56

>> Standard_Deviation_For_Group_B = std(Density_B)

Standard_Deviation_For_Group_B =

95.22

>>

Copyright 2010 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s).

圀圀圀⸀夀䄀娀䐀䄀一倀刀䔀匀匀⸀䌀伀䴀圀圀圀⸀夀䄀娀䐀䄀一倀刀䔀匀匀⸀䌀伀䴀