對50臺某種電子設(shè)備的壽命逐臺進行測試,得到下列數(shù)據(jù)(單位:小時):

910,1220,1280,20,2330,900,860,1450,1220,550,160,2020,1590,1730,490,1620,560,530,500,240,1280,60,190,290,740,1160,220,910,40,l410,3650,3410,70,510,1270,610,310,220,370,60,1750,890,790,1280,570,760,50,1530,1860,1280.

(1)列出樣本的頻率分布表.

(2)畫出頻率分布直方圖.

(3)根據(jù)所得結(jié)果估計,壽命小于2500h的電子設(shè)備的百分比約是多少?

答案:略
解析:

解:(1)頻率分布表如下表:

(2)頻率頒直方圖如答圖所示.

(3)觀察上圖表知,小于2500h的約占96%.


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對50臺某種電子設(shè)備的壽命逐臺進行測試,得到下列數(shù)據(jù)(單位:小時):

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(2)畫出頻率分布直方圖;

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