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Seconds freq. Lower Boundaries Class Mark (x) fx   Cumulative Frequency (cf) (x-x̅)2 f(x-x̅)2 66-70 4 65.5 68 272 21 44.4889 177.9556 61-65 8 60.5 63 504 17 2.7889 22.3112 56-60 7 55.5 58 406 9 11.0889 77.6223 51-55 2 50.5 53 106 2 69.3888 138.7776   ∑f = 21     ∑fx = 1288     ∑ f(x-x̅)2 = 416.67 Look for the: (check if all the data except the seconds and frequency are correct) a) mean time b) median time c) mode

Seconds freq. Lower Boundaries Class Mark (x) fx   Cumulative Frequency (cf) (x-x̅)2 f(x-x̅)2 66-70 4 65.5 68 272 21 44.4889 177.9556 61-65 8 60.5 63 504 17 2.7889 22.3112 56-60 7 55.5 58 406 9 11.0889 77.6223 51-55 2 50.5 53 106 2 69.3888 138.7776   ∑f = 21     ∑fx = 1288     ∑ f(x-x̅)2 = 416.67 Look for the: (check if all the data except the seconds and frequency are correct) a) mean time b) median time c) mode

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Seconds

freq.

Lower Boundaries

Class Mark

(x)

fx

 

Cumulative Frequency

(cf)

(x-x̅)2

f(x-x̅)2

66-70

4

65.5

68

272

21

44.4889

177.9556

61-65

8

60.5

63

504

17

2.7889

22.3112

56-60

7

55.5

58

406

9

11.0889

77.6223

51-55

2

50.5

53

106

2

69.3888

138.7776

 

∑f = 21

 

 

∑fx = 1288

 

 

∑ f(x-x̅)2 = 416.67

Look for the: (check if all the data except the seconds and frequency are correct)

a) mean time

b) median time

c) mode

d) variance

e) standard deviation

f) range

 

 

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