A class has 15 students whose ages are 14, 17, 15, 14, 21, 19, 20, 16, 18, 17, 20, 17, 9, 20, 16 years respectively. One student is selected in such a manner that each has the same chance of being selected and the age X' of the selected studentis recorded. What is the expectation of X?

A class has 15 students whose ages are 14, 17, 15, 14, 21, 19, 20, 16,

1.	A class has 15 students whose ages are 14, 17, 15, 14, 21, 19, 20, 16, 18, 17, 20, 17, 9, 20, 16 years respectively. One student is selected in such a manner that each has the same chance of being selected and the age X' of the selected studentis recorded. What is the expectation of X?
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A class has 15 students whose ages are 14, 17, 15, 14, 21, 19, 20, 16, 18, 17, 20, 17, 9, 20, 16 years respectively. One student is selected in such a manner that each has the same chance of being selected and the age X' of the selected studentis recorded. What is the expectation of X?

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