The histogram shows the ages of 25 CEOs listed on a certain website. Based on the distribution, what is the approximate mean age of the CEOs in this data set? Write a sentence in context (using words in the question) interpreting the estimated mean.

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A: The middle 95% of the data is,
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A: From the given information, the mean is 0 and the sigma is 1.
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Q: Please show TI 84 steps
A: It is given that degrees of freedom is 11.