Question

8. The median of 8 numbers is 4.5. Given that seven
of the numbers are 9, 2, 3, 4, 12, 13 and 1, find the
eighth number.​

Answer 1

Answer: The eighth number is 5

Step-by-step explanation:

Let the 8th term be x:

Data: 9, 2, 3, 4, 12, 13, 1, x

• Arrange in ascending order: (missing value is after 4)

1, 2, 3, 4, x , 9, 12, 13

Now, formula:

Median = [(n/2) term + (n/2 + 1) term]/2

Median = (4th term + 5th term)/2

Median = (4 + x)/2

4.5 = (4+x)/2

9 = 4+x

x = 5

∴ The eighth number is 5

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