Question

Question 32-35 are related
Average speed on a freeway is 76 mph. Ten percent (10%) of vehicles is drive 12 miles above the speed limit of 70 miles per hour.
32	What fraction of vehicles drive below the speed limit?
a	0.1841
b	0.1357
c	0.1003
d	0.0885
33	What fraction drive within ±5 mph from the mean?
a	0.6262
b	0.6626
c	0.7154
d	0.7546
34	What fraction drive within ±1.5 standard deviations from the mean?
a	0.8219
b	0.8664
c	0.8856
d	0.9032
35	The middle interval within which 90% of vehicles drive is _______ to _______ mph. (Round your answers to the nearest integer.)
a	70.0	82.0
b	68.3	83.7
c	66.8	85.2
d	65.1	86.9

Answer 1