[单选题]某镇有居民1000户,其中高、中、低收入户分别为100户、400户、500户,为了调查该镇居民对某商品的潜在需求量,拟抽取60户进行调查。已知各 类居民户的收入标准差估计值分别为:高收入户10000元,中收入户6000元,低收入户3000元。使用分层最佳抽样法,则需从低收入居民户中抽取( )户。
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[单选题]某镇有居民1000户,其中高、中、低收入户分别为100户、400户、500户,为了调查该镇居民对某商品的潜在需求量,拟抽取60户进行调查。已知各 类居民户的收入标准差估计值分别为:高收入户10000元,中收入户6000元,低收入户3000元。使用分层最佳抽样法,则需从低收入居民户中抽取( )户。
A.20
B.25
C.19
D.30
A.20
B.25
C.19
D.30
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