In order to assess the protective immunizing activity of various whooping cough vaccines, suppose that 30 batches of different vaccines are tested on groups of children. Suppose that the following data give immunity percentage in home exposure values (IPHE values).
|
85
|
51
|
41
|
90
|
91
|
40
|
39
|
69
|
45
|
47
|
|
42
|
12
|
70
|
38
|
97
|
34
|
94
|
77
|
88
|
91
|
|
79
|
90
|
43
|
40
|
89
|
85
|
71
|
30
|
25
|
21
|
(a) Find the mean, variance, and standard deviation and interpret.
(b) Construct a frequency table with ?ve classes.
(c) Using the grouped data formula, ?nd the mean, variance, and standard deviation for the table in part (b) and compare it to the results in part (a).