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頻率長條圖中組距與組數的决定與數據的數量有關,一般數據較多,分的組也多;數據較少,分的組也少.當數據個數在50以內時,一般分5~8組;當數據個數在50~100之間時,一般分8~12組.若有的組內的頻數為0,則應該放寬組距.
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