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Probability is a measure of the likelihood that a particular event will occur, expressed as a number between 0 and 1. In the context of households having HD televisions, understanding the probability of a household owning one can help determine if having none is unusual. If the probability of ownership is high, then having no HD televisions would be considered an unusual event.

Statistical significance refers to the likelihood that a relationship observed in data is not due to random chance. In this scenario, determining whether it is unusual for a household to have no HD televisions involves assessing how many households typically own them. If the proportion of households without HD televisions is significantly lower than expected, it would be deemed unusual.

Normal distribution is a probability distribution that is symmetric about the mean, indicating that data near the mean are more frequent in occurrence than data far from the mean. In analyzing household ownership of HD televisions, understanding the normal distribution can help identify what constitutes typical versus unusual ownership patterns, allowing for a clearer assessment of whether having no HD televisions is an outlier.