Construct a $95\%$ confidence interval for the average speed of vehicles on a street, if a sample of $30$ vehicle speeds yields an average of $37\mathrm{.}6$ with standard deviation $9\mathrm{.}2.$ Enter your answer as an inequality with no spaces, using numbers to $3$ decimals in the following style, with m standing in for the population mean $($cut and paste the below and then change the endpoints as needed$)$: $12\mathrm{.}345$