Warning: file_put_contents(): Only 0 of 6320 bytes written, possibly out of free disk space in /home/www/wwwroot/zidian/201990.com/index.php on line 55 class mid-value是什么意思，class mid-value的翻译，class mid-value音标、读音、用法和例句_耀久九英英词典
The method that using weighted arithmetic average of class interval' class mid-value in computing the average is troublesome and is wrong. 运用组距数列组中值加权算术平均法计算平均指标比较麻烦，也容易出错；