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A study is run to estimate the mean total cholesterol level in children 2-6 years of age. A sample of 9 participants is selected and

A study is run to estimate the mean total cholesterol level in children 2-6 years of age. A sample of 9 participants is selected and their total cholesterol levels are measured as follows.

175 215 230 196 175 180 194 147 223

The interquartile Range (IQR) is

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