Regarding Cost optimization of EC2 or Virtual machine

Scenario:- For a compute instance where downsize\Rightsize recommendation is suggested once its Memory utilization is lower than 50% and CPU utilization is less than 70%

Quention 1: - While looking the metric , are metrics looked on Average Percentile, Minimum percentile and Maximum percentile  of 70% is considered or It is just Avg , Min and Max value , which is considered.

Quention 2 - While recommending the downsize\Rightsize , does the capacity of next SKU can handle the configuration of current SKU (i.e. No. of dis attached can be handled by new SKU size)