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 How to find the missing number if median is given? The median is the middle number. If there is an odd number of numbers in the set, the median is the middle number, and the only way to find the missing number is if the median is the missing number. If there is an even number of numbers in the set, the median is the average of the two middle numbers, and the only way to find the missing number is if the median is one of those two numbers. If it is, you can take the median and the one of the two numbers you know. Use the formula (# +#)/2=median and solve. Find the missing number below given the Median=8 3 - 4 - 4 - x - 10 - 10 - 11 - 12 There is an even number of numbers in the set, so the median is the average of the two middle numbers (once the numbers are arranged from least to greatest).. $8=\frac{x+10}{2}$ 16 = x + 10 6 = x The missing value is 6