What is the average height of the class?

1.	What is the average height of the class?
A.	if the data in Statement I alone is sufficient to answer the question but the data in Statement II alone is not sufficient to answer the question.
B.	if the data in Statements II alone is sufficient to answer the question but the data in Statement I alone is not sufficient to answer the question.
C.	if the data in Statement I and II together are necessary to answer the question.
D.	if the data in Statement I and II together are not sufficient to answer the question.
Answer» D. if the data in Statement I and II together are not sufficient to answer the question.

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What is the average height of the class?

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