91Ó°ÊÓ

Given values are,

The population mean is equal to the mean of the sampling distribution of the sample mean:

${\mathrm{μ}}_{\stackrel{¯}{x}}=\mathrm{μ}=225$

The sample as the units of the population mean is the mean of the sampling distribution of the sample mean, and so the mean is $225$seconds.

Given values are,

Let use the below formulae

${\mathrm{σ}}_{\stackrel{¯}{x}}=\frac{\mathrm{σ}}{\sqrt{n}}$

The population mean is equal to the mean of the sampling distribution of the sample mean:

${\mathrm{μ}}_{\stackrel{¯}{x}}=\mathrm{μ}=225$

The sample distribution's standard deviation is

${\mathrm{σ}}_x=\frac{\mathrm{σ}}{\sqrt{n}}=\frac{60}{\sqrt{10}}=18.9737$

The units of the sampling distribution of the sample mean's standard deviation are the same as the units of the population standard deviation, hence the standard deviation is $18.9737$seconds.

The average sample mean play time of ten randomly selected iPod tracks ranges by 18.9737 second based on the average play time of 225 seconds