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歡迎您訪問數學考題練習:某車間有120名工人,為了了解這些工人日加工零!

數學考題練習:某車間有120名工人,為了了解這些工人日加工零

更新時間:2024-01-12 16:42:54作者:貝語網校

某車間有120名工人,為了了解這些工人日加工零件數的情況,隨機抽出其中的30名工人進行調查.整理調查結果,繪制出不完整的條形統計圖(如圖).根據圖中的信息,解答下列問題:

(1)在被調查的工人中,日加工9個零件的人數為________名;

(2)在被調查的工人中,日加工12個零件的人數為________名,日加工________個零件的人數最多,日加工15個零件的人數占被調查人數的________%;

(3)依據本次調查結果,估計該車間日人均加工零件數和日加工零件的總數.

試題答案

解:(1)觀察條形統計圖即可求得日加工9個零件的工人有4人;

(2)日加工零件12個的有:30-4-12-6=8人;

日加工零件14個的有12人,最多,日加工15個零件的人數占被調查人數的百分比為:6÷30×100%=20%;

(3)日加工零件的平均數為:(9×4+12×8+14×12+15×6)÷30=13個,

加工零件總個數為120×13=1560個.

試題解析

(1)直接觀察條形統計圖即可求得日加工9個零件的人數;

(2)用總人數減去其他小組的人數即可求得日加工零件12個的人數;觀察發現日加工零件最多的是加工14個零件的人數;

(3)用加權平均數計算加工零件的平均數即可;

點評:本題考查了條形統計圖及用樣本估計總體的知識,解題的關鍵是從條形統計圖中得到進一步解題的相關信息.

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