The airborne speeds in miles per hour of 21 planes are shown. Find the approximate values that

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The airborne speeds in miles per hour of 21 planes are shown. Find the approximate values that correspond to the given percentiles by constructing a percentile graph.
Class Frequency
366–386.....4
387–407 .......2
408–428 .......3
429–449 .......2
450–470 .......1
471–491 .......2
492–512 .......3
513–533.....4
21
a. 9th 375
b. 20th 389
c. 45th 433
d. 60th 477
e. 75th 504
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