interval	midpoint	freq
100-150^-	125	14
150-200^-	175	14
200-250^-	225	13
250-300^-	275	10
300-350^-	325	5
350-400^-	375	3
400-450^-	425	1
450-500^-	475	1
500-550^-	525	0
550-600^-	575	1