How can graphs help us interpret data?

Charts and graphs are often used to summarize data.

Explanation:

They make it easy to see trends and the amount of variation in the information being studied. (A trend is the direction of change in the data.) For example, people’s average lifespan has generally increased over the last century, even though in a few war years it declined.

significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.

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