Category: Probability and Statistics

Question Number 106405 by john santu last updated on 05/Aug/20 $$\mathrm{A}\mathrm{bag}\mathrm{contains}6\mathrm{white},4\mathrm{red}\mathrm{\&}10$$$$\mathrm{black}\mathrm{balls}.\mathrm{If}\mathrm{two}\mathrm{balls}\mathrm{are}\mathrm{drawn}$$$$\mathrm{at}\mathrm{random},\mathrm{what}\mathrm{is}\mathrm{the}$$$$\mathrm{probability}\mathrm{of}\mathrm{both}\mathrm{being}\mathrm{black}?$$ Answered by bemath last updated on…

Question Number 105934 by Ar Brandon last updated on 01/Aug/20 $$\mathrm{A}\mathrm{box}\mathrm{contains}12\mathrm{balls}\mathrm{numbered}\mathrm{from}1\mathrm{to}12.4\mathrm{balls}$$$$\mathrm{are}\mathrm{selected}\mathrm{successively}\mathrm{without}\mathrm{replacement}.\mathrm{Given}$$$$“{\mathrm{X}}^{″}\mathrm{the}\mathrm{variable}“\mathrm{the}\mathrm{number}\mathrm{of}\mathrm{even}\mathrm{numbered}\mathrm{balls}$$$${\mathrm{selected}}^{″}.\mathrm{Determine}\mathrm{the}\mathrm{probability}\mathrm{type}/\mathrm{law}\mathrm{of}\mathrm{X}.$$ Answered by bobhans last updated on…

Question Number 105670 by Ar Brandon last updated on 30/Jul/20 $$\mathrm{A}\mathrm{machine}\mathrm{manufactures}\mathrm{washers},\mathrm{and}20\mathrm{\%}\mathrm{of}\mathrm{the}\mathrm{production}\mathrm{is}$$$$\mathrm{substandard}.\mathrm{A}\mathrm{random}\mathrm{sample}\mathrm{o}\mathrm{f}10\mathrm{washers}\mathrm{is}\mathrm{selected}.$$$$\mathrm{Find}\mathrm{the}\mathrm{mean}\mathrm{and}\mathrm{standard}\mathrm{deviation}\mathrm{of}\mathrm{the}\mathrm{number}$$$$\mathrm{of}\mathrm{substandard}\mathrm{washers}\mathrm{in}\mathrm{the}\mathrm{sample}.$$ Answered by Ar Brandon last updated…

Question Number 104761 by byaw last updated on 23/Jul/20 $$$$$$\mathrm{A}\mathrm{box}\mathrm{contains}5\mathrm{white}\mathrm{balls},3\mathrm{black}$$$$\mathrm{balls}\mathrm{and}2\mathrm{red}\mathrm{balls}\mathrm{of}\mathrm{the}\mathrm{same}$$$$\mathrm{size}.\mathrm{A}\mathrm{ball}\mathrm{is}\mathrm{selected}\mathrm{at}\mathrm{random}$$$$\mathrm{from}\mathrm{the}\mathrm{box}\mathrm{and}\mathrm{then}\mathrm{replaced}.\mathrm{A}$$$$\mathrm{second}\mathrm{ball}\mathrm{is}\mathrm{then}\mathrm{selected}.\mathrm{Find}$$$$\mathrm{the}\mathrm{probability}\mathrm{of}\mathrm{obtaining}$$$$\:\mathrm{one}\:\mathrm{black}\:\mathrm{ball}\:\mathrm{or}\:\mathrm{red}\:\mathrm{ball}\:\mathrm{in}\:\mathrm{any} \…

Question Number 104707 by byaw last updated on 23/Jul/20 Terms of Service Privacy Policy Contact: info@tinkutara.com