某小区物业征集业主意见,计划从100户业主中抽取20户进行调查。100户业主中有b户户主年龄超过60岁a户户主年龄不满35岁,户主年龄在岁到59岁的有25...

作者: rantiku 人气: - 评论: 0
问题 某小区物业征集业主意见,计划从100户业主中抽取20户进行调查。100户业主中有b户户主年龄超过60岁a户户主年龄不满35岁,户主年龄在岁到59岁的有25户。为了使意见更具代表性,物业采取分层抽样的办法,从b户中抽取了 4户。则a的值可能是( )。 A. 55 B. 66 C. 44 D. 50
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答案 A
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  • 消息: [程序异常] : MISCONF Redis is configured to save RDB snapshots, but it's currently unable to persist to disk. Commands that may modify the data set are disabled, because this instance is configured to report errors during writes if RDB snapshotting fails (stop-writes-on-bgsave-error option). Please check the Redis logs for details about the RDB error.
  • 文件: /twcms/kongphp/cache/cache_redis.class.php
  • 位置: 第 85 行
    <?php echo 'KongPHP, Road to Jane.'; ?>