亚洲男人天堂av,国产一区二区久久精品,国产精品一区二区久久精品,国产精品久久久久久一区二区三区,五月婷婷在线观看视频,亚洲狠狠色丁香婷婷综合

歡迎您訪問數學考題練習:我區很多學校開展了大課間活動.某校初三(1)班!

數學考題練習:我區很多學校開展了大課間活動.某校初三(1)班

更新時間:2024-01-12 16:28:19作者:貝語網校

我區很多學校開展了大課間活動.某校初三(1)班抽查了10名同學每分鐘仰臥起坐的次數,數據如下(單位:次):51,69,64,52,64,72,48,52,76,52.

(1)這組數據的眾數為 ________;求這組數據的中位數;

(2)在對初三(2)班10名同學每分鐘仰臥起坐次數的抽查中,已知這組數據的平均數正好與初三(1)班上述數據的平均數相同,且除眾數(唯一)之外的6個數之和為348.求這組數據的眾數.

試題答案

解:(1) 52;

這組數據從小到大重新排列為:

48,51,52,52,52,64,64,69,72,76.

∵居中的兩個數分別為:52和64,

(52+64)÷2=58,

∴這組數據的中位數為58;

(2)三(1)數據的平均數為:

=(48+51+52+52+52+64+64+69+72+76)=60.

設三(2)班數據的眾數為x,

由題意得:4x+348=10×60,

解得x=63,

∴這組數據的眾數為63.

試題解析

(1)出現次數最多的數為這組數據的眾數,排序后位于中間兩數的平均數為該組數據的中位數;

(2)先計算該組數據的平均數,然后利用已知條件設出眾數列出方程解之即可.

點評:本題考查了眾數、中位數的相關知識,在解決第二問時,先求出平均數,然后根據題目已知條件設出未知數列出方程解得即可.

主站蜘蛛池模板: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |