Question

The number of visitors who attended a local science fair are as shown below.


If the mean number of visitors is 82, how many visitors did the fair have on Friday?

Answer 1

$Mean=\frac{Sumofalldatapoints}{Numberofdatapoints}$

We know,
Mean = 82

Thus,
Sum of the number of visitors throughout the week
$=Mean\times Numberofvisitors$

Let's say the number of visitors on Friday is x.
Therefore, we get:
$82\times 7=46+58+73+68+x+97+101$

$⟹574=443+x$
$⟹574-443=x$

$⟹x=574-443$
$⟹x=131$

Thus, there were 131 visitors on Friday.