The table shows the scores of a group of students in a test. If the average score is 3.5, find the value of x

UniqueD

12 years ago

Average score=£fx/£f

x(studnts)=1.2.3.4.5.6

f(scores)=1+4+5+6+x+2=18+x

fx(f X x)=1+8+15+2+4+5x+12=60+x

apply formula

averge score=£fx/£f

3.5=31/2=7/2

7/2=60+5x/18+x

120+10x=126+7x

120-126=7x-10x(colectn lik terms)

-6=-3x

-6/-3=x

2=x