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Lets order the data from the smallest to the largest:

1.5, 2.9, 4.9 , 6.5, 6.9

7.0, 7.0 ,7.6 ,7.7, 8.0

8.2, 8.2 , 8.5, 8.5, 8.5

8.7, 8.8, 9.2 , 9.3, 9.6

The formula

((B+0.5E)/n)100

Where B = number of scores below the given value E = number of scores equal to the given value n = number of scores

a) 6.5

((3+(0.5 x1)/ 20) x 100

3.5/20 x 100

3.5 x 5

=17.5%

b) 7.7

((8+0.5(1))/20) x 100

8.5 /20 x 100

8.5 x 5

=42.5 %

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