首页
登录
职称英语
Closing prices for a certain stock were recorded each day for a week in the tabl
Closing prices for a certain stock were recorded each day for a week in the tabl
游客
2025-02-27
27
管理
问题
Closing prices for a certain stock were recorded each day for a week in the table above. If the monthly average (arithmetic mean) was 18.43 and the standard deviation was 0.27, how many days during this week did the closing price fall within two standard deviations from the average?
选项
A、1
B、2
C、3
D、4
E、5
答案
C
解析
Since two standard deviations away from the mean works out to 18.43-0.27×2=17.89, there are 3 days during which the stock prices fell between 17.89 and 18.43: Monday, Tuesday, and Wednesday. We really don’t have to worry about prices above the mean, because there were none of them during this time frame.
转载请注明原文地址:https://tihaiku.com/zcyy/3975093.html
相关试题推荐
WINK,Inc.followsacertainprocedurethatrequirestwotaskstobefinishedin
Acertainprosthodontistspecializesinimplantinggoldandsilverteethinhis
Inacertainconservativemutualfund,70percentofthemoneyisinvestedinbo
Acertainlabexperimentswithwhiteandbrownmiceonly.Inoneexperiment,2/3
Acertaintruckuses18gallonsofdieselfuelintraveling270miles.Inorder
Thetablebelowshowstheenrollmentinvariousclassesatacertaincollege.[im
Inacertaingame,eachplayerscoreseither2pointsor5points.Ifnplayers
Acertainjarcontains100jellybeans:50white,30green,10yellow,5red,4
Atacertainuniversityrecreationcenter,amembercanreceivea30-minutemass
Eachofthefivedivisionsofacertaincompanysentrepresentativestoaconfer
随机试题
Thechartbelowshowsthetotalnumberofminutes(inbillions)oftelephone
Manyofthemostflexibleexamplesoftooluseinanimalscomefromprimates
Thegoodnewsisthattoday’steenagersare【C1】________readersandprolific
Withthousandsofyearsofhistoryandmythology【C1】______Athens--named【C
错
某施工单位有一台吊车,购置时公允价值100万元,净残值率为5%,预计可工作100
患者,女,50岁,晨起大便时突然出现剧烈头痛、恶心呕吐、低热及畏光症状,2小时后
把下面的六个图形分为两类,使每一类图形都有各自的共同特征或规律,分类正确的一项是
中国期货业协会依法对期货从业人员实行( )。A.备案管理 B.自律管理 C
燃气管道输气压力为0.6MPa的燃气管道为()燃气管道。A.低压 B.中压A
最新回复
(
0
)