Question

for the data, 18, 9, 7, 5, 11, 7, 17, 20, 19, 2, 17, 12, 5, 1, 13, 12, 11, 15, 16, 20, my homework says the 30th percentile is 9 but I don't think that answer is right. Is it?

Answer 1

1,2,5,5,7,7,9,11,11,12,12,1315,16,17,17,18,19,20,20
total we have 20 number, calculate at 9
percentile of 9 is \(\dfrac{6+0.5 *1}{20}*100\)=32.5 round to 32th %