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:h):
910,1220,1280,20,2330,900,860,1450,1220,550,160,2020,2590,1730,490,1620,560,530,500,240,1280,60,190,290,740,1160,220,910,40,1410,3650,3410,70,510,1270,610,310,220,370,60,1750,890,790,1280,570,760,50,1530,1860,1280
(1)列出樣本的頻率分布表.
(2)畫出頻率分布直方圖和頻率分布折線圖.
(3)估計這批電子設(shè)備的平均壽命和壽命小于2000小時的百分比.
科目:高中數(shù)學(xué) 來源:數(shù)學(xué)教研室 題型:044
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?
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科目:高中數(shù)學(xué) 來源:數(shù)學(xué)教研室 題型:044
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):
910,1220,1280,20,2330,900,860,1450,1220,550,160,2020,1590,1730,490,1620,560,530,500,240,1280,60,190,290,740,1160,220,910,40,1410,3650,3410,70,510,1270,610,310,220,370,60,1750,890,790,1280,570,760,50,1530,1860,1280.
(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2500小時的百分比約是多少?
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科目:高中數(shù)學(xué) 來源: 題型:044
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:h):910
,1220,1280,20,2330,900,860,1450,1220,550,160,2020,2590,1730,490,1620,560,530,500,240,1280,60,190,290,740,1160,220,910,40,1410,3650,3410,70,510,1270,610,310,220,370,60,1750,890,790,1280,570,760,50,1530,1860,1280(1)
列出樣本的頻率分布表.(2)
畫出頻率分布直方圖和頻率分布折線圖.(3)
估計這批電子設(shè)備的平均壽命和壽命小于2000小時的百分比.查看答案和解析>>
科目:高中數(shù)學(xué) 來源: 題型:
910,1 220,1 280,20,2 330,900,860,1 450,
1 220,550,160,2 020,1 590,1 730,490,1 620,
560,530,500,240,1 280,60,190,290,740,1160,220,910,
40,1 410,3 650,3 410,70,510,1 270,610,310,220,370,60,1 750,890,790,1 280,570,760,50,1 530,1 860,1 280.
(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2 500小時的百分比約是多少?
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