Answers

2016-02-26T11:01:30+08:00
First Arrange the Numbers for lowest to highest. Then, the formula is x sub k equals to n over 100 multiply by the total of numbers. ( how many numbers are they ).

= 30 over 100 multiply by 10 = 3 
40 is the answer
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The score 40 is the 90th percentile :-)
  • Brainly User
2016-02-26T11:06:26+08:00
Arrange the data to increasing order:
   15, 18, 20, 23, 28, 28, 33, 35, 40, 42

 P_{k = ( \frac{k}{100} } )(n)

k = 30
n = 10

P₃₀ = (30/100) (10)

P₃₀ = (3/10) (10)

P₃₀ = 3

The score 20 is the 30th percentile.

Note that P₃₀ = D₃  (3rd Decile)
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