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Find the median of the following data set: 112, 45, 88, 67, 92, 34, 55, 76, 21, 49, 82.
67
55
76
59
67
Pairwise elimination of smallest and largest numbers from the unsorted list can quickly reveal the center.
Given data set: 112, 45, 88, 67, 92, 34, 55, 76, 21, 49, 82 with N = 11
Median=(2N+1тАЛ)th┬аterm
Pairwise elimination of smallest and largest numbers from the unsorted list can quickly reveal the center.
Failing to sort the data in ascending order before looking for the middle value.
Sort the Data Set
Arrange all 11 observations in ascending order: 21,34,45,49,55,67,76,82,88,92,112.
21,34,45,49,55,67,76,82,88,92,112
Determine Number of Terms
Count the total number of terms, which gives N=11 (an odd number).
N=11
Apply Median Position Formula
Find the position of the median using Position=2N+1тАЛ.
Position=211+1тАЛ=6
Identify the Median Value
The 6th term in the sorted sequence is 67.
6th┬аterm=67
A is correct because when the data set is arranged in ascending order, the 6th term is 67.
For an even number of observations, remember that the median is the arithmetic mean of the two middle terms.