Power Supply Management testing problem with tolerance

Depending the input voltage supply, 3 power supply mode should be defined as follows:

-in case the input voltage is less than 8.2V then the power supply mode is set to undervoltage -in case the input voltage is greataer than 17.6V than the power supply mode is set to overvoltage -otherwise the power supply mode is set to normalvoltage

Note: The voltage tolerance of the system measurement is 2%.

a) Define as many test scenarious to be sure that the functionality is correctly. b) Justify the testing strategy applied above.

Thank you