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Which of the following statements is/are true concerning the standard normal distribution?

I. It is symmetric.

II. It always has a mean of $0$ and standard deviation of $1$.

III. It is normal only if the sample size is large enough (say, more than $30$).

A

I and III only.

B

II and III only.

C

I and II only.

D

II only.

E

I, II, and III.

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