Problem 3 Interpreting Histograms

Is each histogram uniform, symmetric, or skewed?

1. 
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   This histogram is symmetric because the halves are close to mirror images.

2. 
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   This histogram is skewed because the peak is not in the center.

✓ Got It?

3. 1. The following set of data shows the numbers of dollars Jay spent on lunch over the last two weeks. Make a histogram of the data. Is the histogram uniform, symmetric, or skewed?

      17 1 4 11 14 14 5 16 6 5 9 10 13 9

   2. Reasoning How much money should Jay plan to bring for lunch next week? Explain your reasoning.

Problem 4 Making a Cumulative Frequency Table

Text Messaging The numbers of text messages sent on one day by different students are shown below. What is a cumulative frequency table that represents the data?

17 3 1 30 11 7 1 5 2 39 22 13 2 0 21 1 49 41 27 2 0

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• Step 1 Divide the data into intervals. The minimum is 0 and the maximum is 49. You can divide the data into 5 intervals.

• Step 2 Write the intervals in the first column. Record the frequency of each interval in the second column.

• Step 3 For the third column, add the frequency of each interval to the frequencies of all the previous intervals.

✓ Got It?

4. What is a cumulative frequency table that represents the data below?

   12 13 15 1 5 7 10 9 2 2 7 11 2 1 0 15