Question: The following table shows four rows from a frequency distribution table for a sample of n = 20 scores. Use interpolation to find the percentiles

The following table shows four rows from a frequency distribution table for a sample of n = 20 scores. Use interpolation to find the percentiles and percentile ranks requested:

X f Cf C%

40–49 4 20 100 30–39 7 16 80 20–29 4 9 45 10–19 3 5 25

a. Find the 30th percentile.

b. Find the 52nd percentile.

c. What is the percentile rank for X = 46?

d. What is the percentile rank for X = 21?

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