〖例7-1〗某单位测定了100名健康女大学生的血清总蛋白含量（serum,克/升），数据见表7-1，试进行单变量频率分析并绘制直方图。表7-1健康女大学生的血清总蛋白含量74.378.868.878.070.480.580.569.771.273.579.575.675.078.872.072.072.074.371.272.075.073.578.874.375.865.074.371.269.768.073.575.072.064.375.880.369.774.373.573.575.875.868.876.570.471.281.275.070.468.074.072.076.574.376.577.667.372.075.074.373.579.573.574.765.076.581.675.472.772.767.276.572.770.477.268.867.367.367.372.775.873.575.072.773.573.572.781.670.374.373.579.570.476.572.777.284.375.076.570.4数据文件：frequen1.sav
