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Sagot :
The the 21st, 26th, 65th, and 75th percentiles are 19.45, 21.7, 27.85, and 29.50.
How to compute the percentile?
Here, n=8
P21=(21(n+1)100)th value of the observation
=(21⋅9/100)th value of the observation
=1st observation +0.89[2nd-1st]
=15+0.89[20-15
= 19.45
P26 = (26(n+1)100)th value of the observation
=(26⋅9/100)th value of the observation
=2nd observation +0.34[3rd-2nd]
=20+0.34[25-20]
=20+0.34(5)
= 21.7
P65= (65(n+1)100)th value of the observation
=(65⋅9/100)th value of the observation
=5th observation +0.85[6th-5th]
=27+0.85[28-27
= 27.85
P75 = (75(n+1)100)th value of the observation
=(75⋅9/100)th value of the observation
6th observation +0.75[7th-6th]
=28+0.75[30-28]
= 28 + 1.50
= 29.50
Learn more about samples on:
https://brainly.com/question/17831271
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