Your friend is thinking about buying shares of stock in a company. You have been tracking the closing prices of the stock shares for the past 90 trading days. Which type of graph for the data, histogram, Pareto or time-series, would be the best to show your friend? Why?

The most meaningful graph would be a standard time-series chart of closing price vs. date. It will show trends and possible technical patterns such as "breakout", "trading range" and "head and shoulders" that may be helpful.

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In this scenario, the best type of graph to show your friend would be a time-series graph.

A time-series graph is a plot of data points over time, which makes it ideal for displaying the closing prices of stock shares over the past 90 trading days. This graph type will allow your friend to visually track the fluctuations in the stock's value over time.

By using a time-series graph, your friend can quickly identify trends and patterns in the stock's performance. They can observe if the stock's value has been consistently increasing, decreasing, or fluctuating wildly. This information will be crucial for making an informed decision about whether to invest in the company's shares.

Moreover, a time-series graph can enable your friend to spot any potential seasonality or periodicity in the stock's behavior. For example, if the graph shows consistent price dips during certain times of the year, your friend might want to consider this information while making their investment decision.

In summary, a time-series graph is the most appropriate choice to visually represent the closing prices of stock shares over time, allowing your friend to analyze trends, patterns, and potential seasonality in the stock's behavior.