FUNDAMENTALS OF BUSINESS MATHEMATICS AND STATISTICS I 5.65
(iii) 1, 2, 3, 4, ..... 9, 10 [Ans. 2.87]
(iv) 4, 5, 6, 6, 7, 8 [Ans. 1.29]
(v) 9, 7, 5, 11, 1, 5, 7, 3. [Ans. 3.072]
- The frequency distribution of heights of 50 persons is shown below :
Height (inches) No. of persons
62 8
64 13
66 17
68 12
Find s.d. and variance. [Ans. 2.02 inch. 4.50 sq. inch]
- Find s.d. from the tables :
(i) Age (yrs.) Persons
30 64
40 132
50 153
60 140
70 51 [Ans. 11.64 yrs.]
(ii) Class-limits Frequency
4.5 1
14.5 5
24.5 12
34.5 22
44.5 17
54.5 9
64.5 4 [Ans. 13.25]
- Compute s.d. from the following tables :
(i) Height (inch) Students
60–62 34
62–64 27
64–66 20
66–68 13
68–70 5
Total 100 [Ans. 2.41 inch]
