A school in New Zealand collected data about the employment status of the mother and father in two-parent families. The two-way table of column relative frequencies below shows the data. Father works full time Father works part time Father not working
Mother works full time 0.170.170, point, 17 0.140.140, point, 14 0.130.130, point, 13
Mother works part time 0.230.230, point, 23 0.140.140, point, 14 0.070.070, point, 07
Mother not working 0.600.600, point, 60 0.710.710, point, 71 0.800.800, point, 80
Column total 1.001.001, point, 00 1.001.001, point, 00 1.001.001, point, 00
Based on the data, which of the following statements must be true for the two-parent families at that school?