It is: (4+5)/2 = 4.5
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the median is the middle in a set of numbers so if you had a set of 5 numbers like -2, -1, 0, 1, and 2 the middle number would be zero.
The median number of 1 through 9 is 5. Median is the middle number, while mean number is the numbers added together and divided by the number of numbers.
List the numbers in order. If there is an ODD number of numbers, the median is the number in the middle (eg if there are 11 numbers listed, the median is the (11+1)÷2 = 6th number). If there is an EVEN number of numbers, the median is the mean of the middle two (eg if there are 12 numbers listed, the median is the mean of the (12÷2) = 6th and the 6th+1 = 7th numbers, ie (6th+7th)÷2.)
The median of the set of all the whole numbers starting from 1 and ending with 9 is 5. The numbers are 1,2,3,4,5,6,7,8,9 and the median (middle number) is the number 5.
If you have at least two numbers than you always have a median. If the number of numbers is odd (e.g. you have the number 1, 3, 7, 9, 52), then the median is the middle number when arranged in numerical order (in this example median is 7. If the number of numbers is even (e.g. you have the numbers 1, 3, 7, 9, 52, 103), the the median is the average of the two middle numbers (in this case the average of 7 and 9 which is 8).