3-66. In a NiCd battery, a fully charged cell is composed of nickelic hydroxide. Nickel is an element that has multiple oxi- dation states. Assume the following proportions of the states: Nickel Charge Proportions Found 0.17 +2 0.35 +3 0.33 +4 0.15 (a) Determine the cumulative distribution function of nickel charge. (b) Determine the mean and variance of the nickel charge.

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