Speed regulations on roads is decided on the basis of
(A) 60 percentile cumulative frequency
(B) 75 percentile cumulative frequency
(C) 80 percentile cumulative frequency
(D) 85 percentile cumulative frequency
(A) 60 percentile cumulative frequency
(B) 75 percentile cumulative frequency
(C) 80 percentile cumulative frequency
(D) 85 percentile cumulative frequency