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To find the frequency of people who responded with 2β3 cups of coffee per day, we count the number of responses that fall within that range. From the given responses, there are 6 people who drink 2 cups of coffee per day and 4 people who drink 3 cups of coffee per day. Therefore, the frequency of people who responded with 2β3 cups of coffee per day would be 6 + 4 = 10.
Therefore, the bar representing the frequency of people who responded with 2β3 cups of coffee per day would be 10 units tall in the histogram.