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Properties of distributions

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In these problems, the word average refers to the arithmetic mean x̄ or µ, properties

4. General suppose that x has a distribution with µ = 72 and σ= 8.

A). If random samples of size n = 16 are selected, can we say anything about the x̄ distribution of sample means?

B). If the original x distribution is normal, can we say anything about the x̄ distribution of random samples if size 16? Find P(68 ≤ x̄ ≤ 73).
A. P(68 &#8804; x&#772; &#8804; 73) = P(68 < x&#772; < 73)

B Conversion here is necessary but i am not sure how to do this

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The expert examines the properties of distribution. The conversion of the distribution is determined.

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4. General suppose that x has a distribution with µ = 72 and &#963;= 8.

A). If random samples of size n = 16 are selected, can we say anything about ...

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