MENARCHE

Data:

     Age Total Menarche
1   9.21   376        0
2  10.21   200        0
3  10.58    93        0
4  10.83   120        2
5  11.08    90        2
6  11.33    88        5
7  11.58   105       10
8  11.83   111       17
9  12.08   100       16
10 12.33    93       29
11 12.58   100       39
12 12.83   108       51
13 13.08    99       47
14 13.33   106       67
15 13.58   105       81
16 13.83   117       88
17 14.08    98       79
18 14.33    97       90
19 14.58   120      113
20 14.83   102       95
21 15.08   122      117
22 15.33   111      107
23 15.58    94       92
24 15.83   114      112
25 17.58  1049     1049

Description:

Proportions of female children at various ages during adolescence who have reached menarche (data from Warsaw).

Format:

- Age
Average age of the group. (The groups are reasonably age homogeneous.)

- Total
Total number of children in the group.

- Menarche
Number who have reached menarche.

Task:

Model the proportions of female children in Warsaw at various ages during adolescence who have reached menarche.