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Below are the scores of a group of students in a test
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Below are the scores of a group of students in a test
Scores123456No. of students1456x2
If the average scores is 3.5, find the value of x

A.

1

B.

2

C.

3

D.

4

Correct answer is B

Scores123456No. of students1456x2
Average = 3.5

3.5 = (1×1)+(2×4)+(3×5)+(4×6)+5x+(6×2)1+4+5+6+x+2

3.51 = 1+8+15+24+5x+1218+x

3.51 = 60+5x18+x

60 + 5x = 3.5(18 ÷ x)

60 + 5x = = 63 + 1.5x

5x - 1.5x = 63 - 60

1.5x = 3

x = 31.5

3015 = 2