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Find the median of the data given below. 180, 90, 134, 68, 52, 152, 88, 110
89
60
100
110
100
Count N = 8 (even). Sort the numbers and pick the 4th and 5th terms: 52, 68, 88, 90, 110, ... The 4th and 5th terms are 90 and 110. Their midpoint is (90 + 110)/2 = 100.
Data values: 180, 90, 134, 68, 52, 152, 88, 110. Total number of observations N = 8.
Median=2(2NтАЛ)thterm+(2NтАЛ+1)thtermтАЛ
Count N = 8 (even). Sort the numbers and pick the 4th and 5th terms: 52, 68, 88, 90, 110, ... The 4th and 5th terms are 90 and 110. Their midpoint is (90 + 110)/2 = 100.
Calculating the median without first arranging the data in ascending or descending order, leading to an incorrect result like (68 + 52)/2 = 60.
Arrange the Data in Ascending Order
To find the median, first write the given numbers in order from smallest to largest.
Sorted┬аData:┬а52,68,88,90,110,134,152,180
Determine the Number of Observations
Count the total number of terms N in the data set.
N=8(an┬аeven┬аnumber)
Apply the Median Formula for Even N
When N is even, the median is the arithmetic mean of the (2NтАЛ)th and (2NтАЛ+1)th terms.
2NтАЛ=4th┬аterm=90,(2NтАЛ+1)=5th┬аterm=110
Calculate the Final Median
Take the average of the 4th and 5th terms.
Median=290+110тАЛ=2200тАЛ=100
C is correct because the average of the 4th term (90) and 5th term (110) in the sorted data set is 100.
For grouped data, median is found using cumulative frequency and the formula Median=L+(f2NтАЛтИТcfтАЛ)├Чh. Always remember that ordering data is essential for finding positional averages like median and quartiles.