4.4平均值和范围

以下是11个包裹的质量，精确到最接近的千克。

24，23日,23日,26日,25，27，18日,96，16日,17，32

求模态。

给出为什么平均值不适合使用的理由。

［1］

时间,t{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true}" class="Wirisformula" role="math" alt="t" style="vertical-align:-6px;height:22px;width:7px" loading="lazy">每50名学生到学校所花费的时间被记录下来。
下表显示了结果。

时间(t{"language":"en","fontFamily":"Times New Roman","fontSize":"18"}" class="Wirisformula" role="math" alt="t" style="vertical-align:-6px;height:22px;width:7px" loading="lazy">分钟)	0<t≤10{"language":"en","fontFamily":"Times New Roman","fontSize":"18"}" class="Wirisformula" role="math" alt="0小于t小于或等于10" style="vertical-align:-6px;height:22px;width:66px" loading="lazy">	10<t≤15{"language":"en","fontFamily":"Times New Roman","fontSize":"18"}" class="Wirisformula" role="math" alt="10小于t小于等于15" style="vertical-align:-6px;height:22px;width:75px" loading="lazy">	15<t≤20{"language":"en","fontFamily":"Times New Roman","fontSize":"18"}" class="Wirisformula" role="math" alt="15小于t小于等于20" style="vertical-align:-6px;height:22px;width:75px" loading="lazy">	20<t≤40{"language":"en","fontFamily":"Times New Roman","fontSize":"18"}" class="Wirisformula" role="math" alt="20小于t小于等于40" style="vertical-align:-6px;height:22px;width:75px" loading="lazy">
频率	7	19	16{"language":"en","fontFamily":"Times New Roman","fontSize":"18"}" class="Wirisformula" role="math" alt="16" style="vertical-align:-6px;height:22px;width:19px" loading="lazy">	8{"language":"en","fontFamily":"Times New Roman","fontSize":"18"}" class="Wirisformula" role="math" alt="8" style="vertical-align:-6px;height:22px;width:10px" loading="lazy">

写下模态类。