Given that
The cups were sold on the following days as
73, 68, 82, 90, 77, 89, 71
And we have to find the mean of this data.
Explanation -
The formula for the mean is given as
[tex]Mean=\frac{sum\text{ of all observations}}{total\text{ observations}}[/tex]As there are total observations = 7
[tex]Mean=\frac{73+68+82+90+77+89+71}{7}=\frac{550}{7}=78.57[/tex]So the mean is 78.57
Final answer -
Hence the final answer is 78.57