One of the agents who answered your question earlier, Jeffrey Carter, said it well. Home sales are based on market value and not assessed value.
Just to expand on his answer, the market value of a home is determined by what buyers are willing to pay for it. The only way we can get an idea as to the market value of a home is to look at homes in the same local market, that have sold in the past 6 months, that are most comparable to the home currently on the market.
When I say most comparable I mean style, number of bedrooms, bathrooms, location, condition, features, updates, etc. Based on that, an agent, knowledgeable in the local market, will be able to come up with a price range in which the active home would be expected to sell. Where in that range will be determined by whether the home is more comparable to the homes that sold in the upper end, middle end or lower end of that price range.
Whether you are selling a home, or buying a home, you can ask an agent to do a market analysis of the home you are considering. All the best!