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In the image, we are given a histogram showing the distribution of dissolved oxygen concentration in streams with water temperatures colder than 8°C. The question asks us to describe this distribution based on the histogram.

### Description of the Histogram:
- The x-axis represents the **Dissolved Oxygen Concentration (mg/L)**, ranging from 3 to 14 mg/L.
- The y-axis shows the **Frequency**, indicating the number of streams that correspond to each concentration range.
- The bars in the histogram reflect the frequency of samples for specific dissolved oxygen concentrations.

### Key Points of the Distribution:
1. **Shape of Distribution**: The histogram is roughly symmetric, with a peak in the middle and tapering off towards the lower and higher concentrations. This suggests that most samples are centered around a particular concentration, creating a bell-shaped distribution.
   
2. **Center (Mode)**: The mode, or the most frequent dissolved oxygen concentration, appears around **9 mg/L** (with the highest frequency of 117 samples).

3. **Spread**: The values range from **4 mg/L** to about **13 mg/L**, indicating that the dissolved oxygen concentration in colder streams spans a wide range.

4. **Outliers**: There don't appear to be significant outliers, as the data smoothly decreases on both sides of the mode without any sudden gaps.

5. **Skewness**: The distribution is approximately **symmetric**, meaning that there is no pronounced skew to the left or right.

Would you like more details on any part of this explanation, or do you have any specific questions about the data? Here are five related questions to explore the concept further:

1. What would the distribution look like for streams with temperatures warmer than 8°C?
2. How does the shape of a histogram help in understanding data distributions?
3. What other statistical measures (like mean or standard deviation) could we calculate based on this histogram?
4. How could this data inform researchers about the health of aquatic ecosystems?
5. What might cause variations in dissolved oxygen concentration between different streams?

### Tip:
Remember that histograms are excellent tools for visualizing data distributions, and they help in identifying key features like central tendency, spread, and skewness at a glance.

As part of a study on the chemistry of Alaskan streams, researchers took water samples from many streams with temperatures colder than 8°C and from many streams with temperatures warmer than 8°C. For each sample, the researchers measured the dissolved oxygen concentration, in milligrams per liter (mg/L). Based on the histogram, describe the distribution of dissolved oxygen concentration in streams with water temperatures colder than 8°C.

Analyze a histogram representing dissolved oxygen concentration in streams with temperatures colder than 8°C. Learn to describe key statistical features such as symmetry, mode, spread, and skewness based on this real-world data. Suitable for students in Grades 10-12 studying statistics and data interpretation.

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