~MATHS~有關頻數問題(急)

2009-11-23 8:02 am
甲公司收集了30名員工的每月薪酬資料,及將資料加以整理,列表如下:
組限(千元)*組界(千元)*組標(千元)*頻數
12-17*   ?   *   ?  *1
18-23*   ?   *   ?  *2
24-29*   ?   *   ?  *4
30-35*   ?   *   ?  *?
36-41*   ?   *   ?  *6
42-47*41.5-47.5 *  44.5*4
       (總數:30)
問~~
(A)請完成以上的頻數分佈表?
(B)利用頻數分佈表內的數據,請繒畫組織圖於方格繪圖紙上?
(C)利用頻數分佈表內的數據,找出以上數據的平均數,標準差及相對離差?
(D)B公司擁有員工27名,而平均月薪為28.500元.請找出兩間公司員工的合併平均月薪?

回答 (1)

2009-11-23 6:27 pm
✔ 最佳答案
From the class of 42 - 47, you can see that the class boundaries are (41 + 42)/2 = 41.5 and (47 + 48)/2 = 47.5, so you can do the same for the other classes.
Also, class mark = (41.5 + 47.5)/2 = 89/2 = 44.5, so do the same for the other classes.
Average = Sum of (class mark x frequency) / total frequency ( = 30). In fact, you can make use of your calculator to do the job, same for finding the standard deviation, your calculator can do for you easily.
Let average pay of company A be n, so after mixing with company B, the average pay will be = (30n + 28.5 x 27)/(30 + 27).



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