Introductory Biostatistics

Prðxb?Þ¼ 0 : 10

¼Pr

x
 123 : 9

13 : 74

b

?
123 : 9

13 : 74



and from Example 3.5 we have

1 : 28 ¼

?
123 : 9

13 : 74

leading to

?¼ 123 : 9 þð 1 : 28 Þð 13 : 74 Þ

¼ 141 : 49

TABLE 3.9

Systolic Blood Pressure (mmHg)

Age (Years) Mean Standard Deviation

16 118.4 12.17
17 121.0 12.88
18 119.8 11.95
19 121.8 14.99
20–24 123.9 13.74
25–29 125.1 12.58
30–34 126.1 13.61
35–39 127.1 14.20
40–44 129.0 15.07
45–54 132.3 18.11
55–64 139.8 19.99

TABLE 3.10

Age

Hypotension

if below:

Lowest

Healthy

Highest

Healthy

Hypertension

if above:

16 98.34 102.80 134.00 138.46
17 99.77 104.49 137.51 142.23
18 100.11 104.48 135.12 139.49
19 97.10 102.58 141.02 146.50
20–24????
25–29????
30–34 103.67 108.65 143.55 148.53
35–39 103.70 108.90 145.30 150.50
40–44 104.16 109.68 148.32 153.84
45–54 102.47 109.09 155.41 162.03
55–64 106.91 114.22 165.38 172.74

130 PROBABILITY AND PROBABILITY MODELS