absolute grading excel

=COUNTIFS(P8:P158, ">=91", P8:P158, "<=100")
=COUNTIFS(P8:P158, ">=81", P8:P158, "<=90")
=COUNTIFS(P8:P158, ">=71", P8:P158, "<=80")
=COUNTIFS(P8:P158, ">=61", P8:P158, "<=70")
=COUNTIFS(P8:P158, ">=51", P8:P158, "<=60")
=COUNTIFS(P8:P158, ">=41", P8:P158, "<=50")
=COUNTIFS(P8:P158, ">=31", P8:P158, "<=40")
=COUNTIFS(P8:P158, ">=0", P8:P158, "<=30")