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歡迎您訪問數(shù)學考題練習:某一段時間,小芳測得連續(xù)五天的日最高氣溫后,整!

數(shù)學考題練習:某一段時間,小芳測得連續(xù)五天的日最高氣溫后,整

更新時間:2024-01-12 16:32:34作者:貝語網(wǎng)校

某一段時間,小芳測得連續(xù)五天的日最高氣溫后,整理得出下表(有一個數(shù)據(jù)丟失):

日期平均氣溫
最高氣溫1℃2℃-2℃0℃1℃
則這個被丟失的數(shù)據(jù)是

A.2℃

B.3℃

C.4℃

D.5℃

試題答案

C

試題解析

設出丟失的數(shù)據(jù)為x℃,根據(jù)從星期一到星期五的五個數(shù)據(jù)相加的等于平均氣溫,列出關于x的方程,求出方程的解得到x的值,即為被丟失的數(shù)據(jù).

解答:設丟失的數(shù)據(jù)為x℃,

根據(jù)題意列得:(1+2-2+0+x)=1,

解得:x=4,

則這個被丟失的數(shù)據(jù)是4℃.

故選C

點評:此題考查了算術平均數(shù),一組數(shù)據(jù)的算術平均數(shù)的求法為:將各數(shù)據(jù)相加求出和,然后用和除以數(shù)據(jù)的個數(shù).

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