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Moonshield · Answer 1 · 2023-11-28T04:28:11+0000

We are given the number of fire hydrants for 4 neighbourhoods to be:

$17,\text{ 15, 21 and 12}$

The mean of the data set is given to be 15

Let the number of fire hydrants for Prairie Pass be x

The mean of a set of data is calculated using the formula:

$\begin{gathered} \text{Mean }=\text{ }(\sum^n_(n\mathop=1)x)/(n) \\ \text{where n is the total number of data points} \\ \text{and }\sum ^n_(n\mathop=1)\text{ means summation} \end{gathered}$

There are four (4) neighbourhoods hence :

$n\text{ = 4}$

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