4.14样本均值ⅹ的抽样分布或概率分布 Table 4-3 Frequency distribution of 20 sample means Range of Absolute Relative sample mean frequency frequency 8.5-8.9 0.05 90-9.4 0.05 9.5-9.9 025 10.0-104 0.40 10.5-109 584 0.20 11.0-114 0.05 Total 20 1.00 4-104-10 4.1.4样本均值 的抽样分布或概率分布 Table 4-3 Frequency distribution of 20 sample means X