Page 37 - Basic Statistics

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Problem 2.2:

Data on baggage masses in Table 1.3, are presented again in Table 2.2

below. Complete by filling in empty column , then calculate measures of

central location :

a. Mean

b. Median

c. Mode

Table 2.3 Frequency distribution

Classes Frequencies Midpoint fi . xi Cumulative
(kg) ( fi ) ( xi ) Frequencies

0 - 9 5 5 5
10 - 19 11 15 16

20 - 29 20 25 36

30 - 39 9 35 45
40 - 49 13 45 58

50 - 60 7 55 65
N = 65 180 --

Worked Solution:

p
 f i x . i

a. Mean : X = i= 1
n

(5 x 5) + (11x15) + . . . + (7x55) ........
X = = = .......... .......
65 65

~~* CHAPTER 2 NUMERICAL MEASURES TO SUMMARIZE DATA *~~