對(duì)50臺(tái)某種電子設(shè)備的壽命逐臺(tái)進(jìn)行測(cè)試,得到下列數(shù)據(jù)(單位:小時(shí))

9101220,1280,20,2330,900860,14501220,550,1602020,15901730,490,1620,560,530,500,240,1280,60,190,290,740,1160220,910,40,1410,36503410,70,510,1270610,310,220370,60,1750,890790,1280570,760,501530,18601280

(1)列出樣本的頻率分布表;

(2)畫(huà)出頻率分布直方圖;

(3)根據(jù)所得結(jié)果估計(jì),壽命小于2500小時(shí)的百分比約是多少?

答案:略
解析:

解:(1)頻率分布表如下表.

(2)頻率直方圖如圖所示.

(3)觀(guān)察上圖表知,小于2500小時(shí)的約占96%.


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