2025年bec中级真题第四及答案详解.docVIP

2025年bec中级真题第四及答案详解

一、单项选择题（总共10题，每题2分）

1.Whichofthefollowingisthebestwaytodescribetherelationshipbetweentwovariablesifthechangeinonevariableconsistentlyleadstoachangeintheothervariableinthesamedirection?

A.Correlation

B.Causation

C.Independence

D.Randomness

2.Inasurvey,200peoplewereaskedabouttheirfavoritetypeofmusic.120peoplesaidtheypreferredrockmusic,50saidtheypreferredpopmusic,andtherestpreferredclassicalmusic.Whatistherelativefrequencyofpeoplewhopreferclassicalmusic?

A.0.25

B.0.30

C.0.45

D.0.50

3.Ifadieisrolled,whatistheprobabilityofrollinganumbergreaterthan4?

A.1/6

B.1/3

C.1/2

D.2/3

4.Aboxcontains5redballs,3blueballs,and2greenballs.Ifaballisdrawnatrandom,whatistheprobabilityofdrawingaballthatisnotblue?

A.1/3

B.2/5

C.3/5

D.4/5

5.Theaveragescoreofaclassof30studentsis75.Iftheaveragescoreof10studentswhoscored70isremoved,whatwillbethenewaveragescoreoftheremainingstudents?

A.72.5

B.73.5

C.74.5

D.75.5

6.Ifafunctionf(x)=3x+2,whatisthevalueoff(5)?

A.13

B.17

C.20

D.25

7.Theslopeofalinethatpassesthroughthepoints(2,3)and(4,7)is:

A.1

B.2

C.3

D.4

8.Inatriangle,ifthesumoftwoanglesis90degrees,thetriangleiscalled:

A.Acute

B.Right

C.Obtuse

D.Equilateral

9.Theareaofacirclewitharadiusof5unitsis:

A.10π

B.15π

C.20π

D.25π

10.Ifatraintravelsataspeedof60km/h,howfarwillittravelin3hours?

A.60km

B.120km

C.180km

D.240km

二、填空题（总共10题，每题2分）

1.Themeanofthenumbers2,4,6,8,and10is_______.

2.Themedianofthenumbers3,1,4,1,and5is_______.

3.Themodeofthenumbers7,7,9,9,and9is_______.

4.Therangeofthenumbers5,10,15,20,and25is_______.

5.Theprobabilityofdrawingaredcardfromastandarddeckof52cardsis_______.

6.Theareaofasquarewithasidelengthof4unitsis____