Which of these is a correct electron-dot representation of the nitrite ion,NO2-? 
Definitions:
Central Tendency
A statistical measure that identifies a single value as representative of an entire distribution, typically via the mean, median, or mode.
Inferential Statistics
The field of statistics focused on drawing conclusions or making forecasts about a whole population from a subset of collected data.
Probability
An indicator of how probable an event is, represented numerically between 0 and 1.
Nonrandom Sampling
A sampling technique where the samples are gathered in a process that does not give all the individuals in the population equal chances of being selected.
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