I don't understand this & i'm behind. it won't let me move on & I have to fill in the data but don't know what

How do i complete this electrolysis of water lab? i’m at home, so i don’t have the materials, and the lab didn’t properly work and was incomplete at school.

Ineed to find the answer of this question because i dont understand it

Awoman's basketball has a circumference between 28.5 and 29.0 inches and a maximum weight of 20 ounces (two significant figures). what are these specifications in units of centimeters and grams?