The missing number in the data set is 1.15
What is the mean of a data set?
The mean of a data set is determined by finding the average of the data set and this can be identified by finding the summation of the data in the dataset divided by the total number of data.
[tex]\mathbf{Mean = \dfrac{18 +16 +x +9 +12 +23}{6}}[/tex]
- We are given that the mean = 15.
Thus;
[tex]\mathbf{15 = \dfrac{18 +16 +x +9 +12 +23}{6}}[/tex]
[tex]\mathbf{15\times 6 =78x}[/tex]
90 = 78x
x = 90/78
x = 1.15
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