The Following Data Are Monthly Rents (In Dollars) of Studio $500,549,569,575,585,600,630,680,705,790$

The following data are monthly rents (in dollars) of studio and one-bedroom apartments in Harrisburg, Pennsylvania, in 2007, obtained from a random sample of such apartments advertised at {rent.com} in July 2007: $500,549,569,575,585,600,630,680,705,790$
The mean of these ten rent prices is $\$ 618.3$ , and the standard deviation is $\$ 85.3$ .
-Determine the standard error of the sample mean.