The following table shows the number of cars sold last month by six dealers at Centreville Nissan dealership and their number of years of sales experience.

Years of Experience Sales

$28$

$38$

$36$

$39$

$89$

$514$

Management would like to use simple regression analysis to estimate monthly car sales using the number of years of sales experience. The standard error of the estimate is equal to $\_\_\_\_\_\_\_\_.$

Multiple Choice

$5\mathrm{.}94$

$3\mathrm{.}54$

$2\mathrm{.}78$

$3\mathrm{.}78$