Question 485381
put the numbers in ascending order: 10,12,15,16,18,20,23,28
use the formula: L=(K/100)N
where:
L= the position of the number in the sequence
K= the quartile (first=25, second=50 and third=75
here we want to know the first quartile so K=25
N= the quantity of numbers in the sequence
and here we have 11 numbers --> 10,12,15,16,18,20,23,28
substituting we have:
L=(25/100)11
L=(25/100)11/1
L=275/100
L=2,75
rounding 2,75 we get 3, is the position of the number in the sequence and the third number is 15. The first quartile is 15