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Category: Probability and Statistics

Suppose-a-job-consists-of-n-tasks-each-of-which-takes-time-t-seconds-Thus-if-there-are-no-failuers-the-sum-over-all-computed-nodes-of-the-time-taken-to-execute-tasks-at-that-node-is-nt-Sppose-also-

Question Number 112359 by udaythool last updated on 07/Sep/20 $$\mathrm{Suppose}\:\mathrm{a}\:\mathrm{job}\:\mathrm{consists}\:\mathrm{of}\:\boldsymbol{{n}}\:\mathrm{tasks} \\ $$$$\mathrm{each}\:\mathrm{of}\:\mathrm{which}\:\mathrm{takes}\:\mathrm{time}\:\boldsymbol{{t}} \\ $$$$\mathrm{seconds}.\:\mathrm{Thus}\:\mathrm{if}\:\mathrm{there}\:\mathrm{are}\:\mathrm{no} \\ $$$$\mathrm{failuers}\:\mathrm{the}\:\mathrm{sum}\:\mathrm{over}\:\mathrm{all}\:\mathrm{computed} \\ $$$$\mathrm{nodes}\:\mathrm{of}\:\mathrm{the}\:\mathrm{time}\:\mathrm{taken}\:\mathrm{to}\: \\ $$$$\mathrm{execute}\:\mathrm{tasks}\:\mathrm{at}\:\mathrm{that}\:\mathrm{node}\:\mathrm{is}\:\boldsymbol{{nt}}. \\ $$$$\mathrm{Sppose}\:\mathrm{also}\:\mathrm{that}\:\mathrm{the}\:\mathrm{probability} \\ $$$$\mathrm{of}\:\mathrm{a}\:\mathrm{task}\:\mathrm{failing}\:\mathrm{is}\:\boldsymbol{{p}}\:\mathrm{per}\:\mathrm{job}\:\mathrm{per} \\…

The-probability-that-you-give-the-right-answer-to-this-question-is-A-0-B-25-C-50-D-100-

Question Number 177814 by mr W last updated on 09/Oct/22 $${The}\:{probability}\:{that}\:{you}\:{give}\:{the}\:{right} \\ $$$${answer}\:{to}\:{this}\:{question}\:{is}… \\ $$$$ \\ $$$$\left.{A}\left.\right)\left.\:\left.\mathrm{0\%}\:\:\:\:{B}\right)\:\mathrm{25\%}\:\:\:\:{C}\right)\:\mathrm{50\%}\:\:\:\:{D}\right)\mathrm{100\%} \\ $$ Commented by cortano1 last updated on…

In-a-class-of-30-pupils-12-are-girls-and-2-of-them-are-short-sighted-Among-18-boys-6-are-short-sighted-If-a-pupil-is-selected-at-random-what-is-the-probability-that-the-pupil-chosen-will-be-

Question Number 112163 by bobhans last updated on 06/Sep/20 $$\mathrm{In}\:\mathrm{a}\:\mathrm{class}\:\mathrm{of}\:\mathrm{30}\:\mathrm{pupils}\:,\:\mathrm{12}\:\mathrm{are}\:\mathrm{girls}\:\mathrm{and}\: \\ $$$$\mathrm{2}\:\mathrm{of}\:\mathrm{them}\:\mathrm{are}\:\mathrm{short}−\mathrm{sighted}.\:\mathrm{Among}\: \\ $$$$\mathrm{18}\:\mathrm{boys}\:,\:\mathrm{6}\:\mathrm{are}\:\mathrm{short}−\mathrm{sighted}\:.\:\mathrm{If}\:\mathrm{a}\:\mathrm{pupil} \\ $$$$\mathrm{is}\:\mathrm{selected}\:\mathrm{at}\:\mathrm{random},\:\mathrm{what}\:\mathrm{is}\:\mathrm{the}\:\mathrm{probability} \\ $$$$\mathrm{that}\:\mathrm{the}\:\mathrm{pupil}\:\mathrm{chosen}\:\mathrm{will}\:\mathrm{be}\: \\ $$$$\begin{cases}{\left(\mathrm{a}\right)\:\mathrm{a}\:\mathrm{girls}}\\{\left(\mathrm{b}\right)\:\mathrm{short}−\mathrm{sighted}}\\{\left(\mathrm{c}\right)\:\mathrm{a}\:\mathrm{short}−\mathrm{sighted}\:\mathrm{boy}}\end{cases} \\ $$ Answered by MJS_new…

There-are-two-cards-one-is-yellow-on-both-sides-and-the-other-one-is-yellow-in-one-side-and-red-on-the-other-The-cards-have-the-same-probability-1-2-of-being-chosen-and-one-is-chosen-and-placed

Question Number 111826 by Aina Samuel Temidayo last updated on 05/Sep/20 $$\mathrm{There}\:\mathrm{are}\:\mathrm{two}\:\mathrm{cards};\:\mathrm{one}\:\mathrm{is}\:\mathrm{yellow}\:\mathrm{on} \\ $$$$\mathrm{both}\:\mathrm{sides}\:\mathrm{and}\:\mathrm{the}\:\mathrm{other}\:\mathrm{one}\:\mathrm{is}\:\mathrm{yellow} \\ $$$$\mathrm{in}\:\mathrm{one}\:\mathrm{side}\:\mathrm{and}\:\mathrm{red}\:\mathrm{on}\:\mathrm{the}\:\mathrm{other}.\:\mathrm{The} \\ $$$$\mathrm{cards}\:\mathrm{have}\:\mathrm{the}\:\mathrm{same}\:\mathrm{probability}\:\left(\frac{\mathrm{1}}{\mathrm{2}}\right) \\ $$$$\mathrm{of}\:\mathrm{being}\:\mathrm{chosen},\:\mathrm{and}\:\mathrm{one}\:\mathrm{is}\:\mathrm{chosen}\:\mathrm{and} \\ $$$$\mathrm{placed}\:\mathrm{on}\:\mathrm{the}\:\mathrm{table}.\:\mathrm{If}\:\mathrm{the}\:\mathrm{upper}\:\mathrm{side} \\ $$$$\mathrm{of}\:\mathrm{the}\:\mathrm{card}\:\mathrm{on}\:\mathrm{the}\:\mathrm{table}\:\mathrm{is}\:\mathrm{yellow}, \\…

Question-111788

Question Number 111788 by 675480065 last updated on 04/Sep/20 Answered by bemath last updated on 05/Sep/20 $$\:{a}\:=\:\mathrm{3}\:,\:{b}\:=\:\mathrm{4}\:;\:{c}\:=\:\mathrm{4} \\ $$$$\Leftrightarrow\:\mathrm{3}!\:\mathrm{3}!\:=\:\left(\mathrm{6}\right)^{\mathrm{2}} \:=\:\mathrm{36} \\ $$$$\Leftrightarrow\:\mathrm{3}!+\mathrm{3}!+\mathrm{4}!\:=\:\mathrm{6}+\mathrm{6}+\mathrm{24}\:=\:\mathrm{36}\: \\ $$ Terms…

Question-111690

Question Number 111690 by bemath last updated on 04/Sep/20 Answered by john santu last updated on 04/Sep/20 $$\:{let}\:\begin{cases}{{white}\:{ball}\:=\:{x}}\\{{red}\:{ball}=\mathrm{2}{x}}\\{{black}\:{ball}=\mathrm{30}−\mathrm{3}{x}}\end{cases} \\ $$$${so}\:{the}\:{number}\:{of}\:{way}\:{to}\:{take}\: \\ $$$$\mathrm{2}\:{white}\:{balls}\:{and}\:\mathrm{1}\:{black}\:{ball}\:{is} \\ $$$${C}_{\mathrm{2}} ^{\:{x}}…

The-mean-median-and-mode-of-the-data-values-90-54-x-123-62-78-58-81-are-all-equal-What-is-the-value-of-x-

Question Number 111533 by Aina Samuel Temidayo last updated on 04/Sep/20 $$\mathrm{The}\:\mathrm{mean},\mathrm{median}\:\mathrm{and}\:\mathrm{mode}\:\mathrm{of}\:\mathrm{the} \\ $$$$\mathrm{data}\:\mathrm{values}\:\mathrm{90},\mathrm{54},\mathrm{x},\mathrm{123},\mathrm{62},\mathrm{78},\mathrm{58},\mathrm{81} \\ $$$$\mathrm{are}\:\mathrm{all}\:\mathrm{equal}.\:\mathrm{What}\:\mathrm{is}\:\mathrm{the}\:\mathrm{value}\:\mathrm{of}\:\mathrm{x}? \\ $$ Commented by Rasheed.Sindhi last updated on 04/Sep/20…

Question-45827

Question Number 45827 by byaw last updated on 17/Oct/18 Commented by MJS last updated on 17/Oct/18 $$\mathrm{the}\:\mathrm{source}\:\mathrm{of}\:\mathrm{these}\:\mathrm{questions}\:\mathrm{is}\:\mathrm{at}\:\mathrm{least}\:\mathrm{not} \\ $$$$\mathrm{accurate},\:\mathrm{always}\:\mathrm{something}\:\mathrm{missing}\:\mathrm{or}\:\mathrm{other} \\ $$$$\mathrm{mistakes} \\ $$ Answered by…

A-coin-that-comes-up-head-with-probability-p-and-tail-with-probability-1-p-independently-of-each-flip-is-flipped-five-times-The-probability-of-two-heads-and-three-tails-is-equal-to-1-7-of-the-proba

Question Number 111276 by Aina Samuel Temidayo last updated on 03/Sep/20 $$\mathrm{A}\:\mathrm{coin}\:\mathrm{that}\:\mathrm{comes}\:\mathrm{up}\:\mathrm{head}\:\mathrm{with} \\ $$$$\mathrm{probability}\:\mathrm{p}\:\mathrm{and}\:\mathrm{tail}\:\mathrm{with}\:\mathrm{probability} \\ $$$$\mathrm{1}−\mathrm{p}\:\mathrm{independently}\:\mathrm{of}\:\mathrm{each}\:\mathrm{flip}\:\mathrm{is}\:\mathrm{flipped}\:\mathrm{five}\:\mathrm{times}. \\ $$$$\mathrm{The}\:\mathrm{probability}\:\mathrm{of}\:\mathrm{two}\:\mathrm{heads}\:\mathrm{and}\:\mathrm{three}\:\mathrm{tails}\:\mathrm{is}\:\mathrm{equal}\:\mathrm{to}\:\frac{\mathrm{1}}{\mathrm{7}}\:\mathrm{of}\:\mathrm{the}\:\mathrm{probability}\:\mathrm{of}\:\mathrm{three} \\ $$$$\mathrm{heads}\:\mathrm{and}\:\mathrm{two}\:\mathrm{tails}.\:\mathrm{Let}\:\mathrm{p}=\frac{\mathrm{x}}{\mathrm{y}},\:\mathrm{where} \\ $$$$\mathrm{gcd}\left(\mathrm{x},\mathrm{y}\right)\:=\mathrm{1}\:.\:\mathrm{Find}\:\mathrm{x}+\mathrm{y}. \\ $$ Answered…