考點:中位數(shù)的意義及求解方法,平均數(shù)的含義及求平均數(shù)的方法
專題:統(tǒng)計數(shù)據(jù)的計算與應(yīng)用
分析:平均數(shù)和中位數(shù)是兩種不相同的統(tǒng)計量,平均數(shù)的求法是:用所有數(shù)據(jù)相加的總和除以數(shù)據(jù)的個數(shù);中位數(shù)的求法:將數(shù)據(jù)按照大小順序排列,如果數(shù)據(jù)個數(shù)是奇數(shù),則處于最中間的數(shù)就是這組數(shù)據(jù)的中位數(shù),如果數(shù)據(jù)個數(shù)是偶數(shù),則中間兩個數(shù)的平均數(shù)就是這組數(shù)據(jù)的中位數(shù);據(jù)此進(jìn)行判斷.
解答:
解:求一組數(shù)據(jù)的平均數(shù)就是用所有數(shù)據(jù)相加的總和除以數(shù)據(jù)的個數(shù);
求一組數(shù)據(jù)的中位數(shù)就是:將數(shù)據(jù)按照大小順序排列,如果數(shù)據(jù)個數(shù)是奇數(shù),則處于最中間的數(shù)就是這組數(shù)據(jù)的中位數(shù),如果數(shù)據(jù)個數(shù)是偶數(shù),則中間兩個數(shù)的平均數(shù)就是這組數(shù)據(jù)的中位數(shù);
所以平均數(shù)就是中位數(shù)說法錯誤.
故答案為:×.
點評:此題考查平均數(shù)和中位數(shù)的意義和求法,要注意:平均數(shù)和中位數(shù)是兩種不相同的統(tǒng)計量.