To calculate the mean of the dataset:
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Sum the values: \( 5 + 5 + 5 + 10 + 15 + 20 + 30 + 40 + 100 + 120 = 300 \)
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Count the number of values: There are 10 values in the dataset.
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Calculate the mean: \( \text{Mean} = \frac{\text{Sum of values}}{\text{Number of values}} = \frac{300}{10} = 30 \)
The mean of the dataset is 30.