Problem 10.5.2
Age (years)
Individual 8 8 +1/2 9 9+1/2
1 47.8 48.8 49.0 49.7 \\
2 46.4 47.3 47.7 48.4 \\
3 46.3 46.8 47.8 48.5 \\
4 45.1 45.3 46.1 47.2 \\
5 47.6 48.5 48.9 49.3 \\
6 52.5 53.2 53.3 53.7 \\
7 51.2 53.0 54.3 54.5 \\
8 49.8 50.0 50.3 52.7 \\
9 48.1 50.8 52.3 54.4 \\
10 45.0 47.0 47.3 48.3 \\
11 51.2 51.4 51.6 51.9 \\
12 48.5 49.2 53.0 55.5 \\
13 52.1 52.8 53.7 55.0 \\
14 48.2 48.9 49.3 49.8 \\
15 49.6 50.4 51.2 51.8 \\
16 50.7 51.7 52.7 53.3 \\
17 47.2 47.7 48.4 49.5 \\
18 53.3 54.6 55.1 55.3 \\
19 46.2 47.5 48.1 48.4 \\
20 46.3 47.6 51.3 51.8 \\
mean 48.66 49.62 50.57 51.45 \\
s. .d 2.52 2.54 2.63
2.73 \\