Help please I have 10 min.

Can someone me with questions 12 and 13 plz.

In a ni-cd battery, a fully charged cell is composed of nickelic hydroxide. nickel is an element that has multiple oxidation states. assume the following proportions of the states: nickel charge proportions found 0 0.17 +2 0.3 +3 0.33 +4 0.5 (a) determine the mean of the nickel charge. enter the answer to 2 decimal places.(b) determine the cumulative distribution function of nickel charge.

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver