首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
The figure above shows a rectangular play area in which one child stands at B while another child runs back and forth along the
The figure above shows a rectangular play area in which one child stands at B while another child runs back and forth along the
admin
2009-05-19
21
问题
The figure above shows a rectangular play area in which one child stands at B while another child runs back and forth along the entire side AD. If the running child is in a position randomly located along side AD at a given time, what is the probability that the two children are at most 50 feet apart at that time?
选项
A、1/5
B、2/5
C、3/5
D、4/5
E、1
答案
D
解析
左面图形表示一个长方形的娱乐区,有一个小孩站在B点,同时另一个小孩在A和D之间来回跑动。若跑步的小孩在AD边上的位置在任一时刻都是随机的,两个小孩最多相距50英尺的概率(probability)是多少?
解:本题的正确答案是(D)。根据题意可知,两个孩子的位置及点A在任意时刻都可构成一个直角三角形,直角三角形的斜边长就是两个孩子之间的距离,两个孩子的距离不超过50英尺,即直角三角形的斜边不超过50英尺,AB=30英尺,根据勾股定理可知,跑步的小孩离A点的距离应不超过40英尺时,才能使他们之间的距离不超过50英尺。而跑步的小孩在AD上的位置是随机的,因此两个小孩最多相距50英尺的概率是40/50=4/5
转载请注明原文地址:https://kaotiyun.com/show/SPkO777K
本试题收录于:
GRE QUANTITATIVE题库GRE分类
0
GRE QUANTITATIVE
GRE
相关试题推荐
Directions:Forthispart,youareallowed30minutestowriteacompositiononthetopic"FastFoodandTraditionalChineseCoo
Directions:Forthispart,youareallowed30minutestowriteacompositiononthetopic"MyIdealJob".Youshouldwriteinno
WhentheUnitedStatesCongresscreatedYellowstoneNationalParkin1872,thegoalwastosetasideaplacewhereAmericanscou
ItusedtodistresslargenumbersofEasternpeopleswholivedmainlyonrice.
A70-footfishingboat,theSharkCatcher,sank5milesfromshoretodayinthePacificatabout4:30p.m.Theboatwasreturnin
Expertssuggestusingadifferentpasswordforeverywebsiteyouvisit,andchangingthepasswordeveryfewmonths.Ittakestro
Ifthepopulationoftheearthgoesonincreasingatitspresentrate,therewilleventuallynotbeenoughresourceslefttokee
IntheUnitedStates,30percentoftheadultpopulationhasa"weightproblem."Tomanypeople,thecauseisobvious:theyeat
Itwas3am,acoldandwetnight,onAugust21,2010.IhadjustleftalocalclubtotraveltenkilometershomewhenIlost【C1
Anintegerfrom10through99,inclusive,istobechosenatrandom.Whatistheprobabilitythatthenumberchosenwillhave0
随机试题
漏尿是一由于膀胱括约肌损伤或神经功能障碍而丧失排尿自控能力,使尿液不自主流出。
患者女性,25岁,近半年来反复中上腹疼痛,痛向背部放射,伴反酸与夜间痛。既往曾有2次黑便史。为明确诊断,应首先的检查有
患者,女,31岁。右侧牙痛3天,龈肿,痛剧,伴口臭,口渴,大便3日未行,舌苔黄,脉洪。治疗除取颊车、下关穴外,还应加()
阿尔迪、里德尔等德国超市折扣连锁店在全球食品涨价潮中逆市走俏。德国模式的折扣连锁店经营方式不同于普通超市、家庭店铺或法国特色的农民市场。它的店面一般仅有两三百平方米,过道狭窄,商品包装简单,80%以上的商品都是食品和饮料,其价格一般要比普通超市低30%到5
下列关于按车型划分运价的说法错误的是()。
下列各项可以作为应收账款入账金额的项目是()。
只有具备了高尚的艺术职业道德,只有对艺术全身心投入的敬业精神,才能使艺术家和演员在物质诱惑面前,______地选择自己所献身的艺术本身。填入横线部分最恰当的一项是()。
TextWhenmyfatherwasgettingreadyforwork.our【C1】______wasruledbyknocksandwords.One【C2】______onthe.tablemeant
Toretaintheirfreshness,theseonionsandtomatoesshouldbeputintotherefrigeratorandstored______23degreesFahrenheit.
Thesesessionswithacounselorare______.
最新回复
(
0
)