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the following are scores of grade 10 sdudents in their math summative test 18,25,20,26,26,22,25,28,28,36,24,19,21,23,27,29,30,25,31 a.1st Quartile/Q1
b.4th decile/D4
c.8th decile/D8
d.50th percentile/p50​