$1$ point

Three new ship prototypes, a destroyer, frigate, and corvette$($the boat$)$ are being evaluated by the time it takes to sink a target by the military. The average time it takes a destroyer to sink the target is $3\mathrm{.}5$ minutes with a standard deviation of $2$ minutes. The average time it takes a frigate to sink the target is $11$ minutes with a standard deviation of $5$ minutes. The average time it takes a corvette to sink the target is $8\mathrm{.}5$ minutes with a standard deviation of $6$ minutes.

The prototype destroyer took $2$ minutes, the prototype frigate took $7$ minutes, and the prototype corvette took $3$ minutes.

Sort the prototypes from most impressive to least impressive for their category.

$1$

Corvette

$2$

Frigate

$3$ Destroyer