Closing prices for a certain stock were recorded each day for a week in the tabl

游客2024-01-14 23

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.

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Closing prices for a certain stock were recorded each day for a week in the tabl

Thiscompanyisclosingup,solotsofworkerswillbelaid______.A、downB、out

WINK,Inc.followsacertainprocedurethatrequirestwotaskstobefinishedin

Closingpricesforacertainstockwererecordedeachdayforaweekinthetabl

Thetablebelowshowstheenrollmentinvariousclassesatacertaincollege.[im

Inacertainflowershop,whichstocksfourtypesofflowers,thereare-asman

Inacertaingame,eachplayerscoreseither2pointsor5points.Ifnplayers

Inacertaintwo-digitnumber,thetens’digitistripletheunits’digit,this

Atacertainuniversityrecreationcenter,amembercanreceivea30-minutemass

Khalildrove120kilometersinacertainamountoftime.Whatwashisaveragesp

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