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