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In which of the following scenarios can we assume a Normal distribution for the sample mean?...

In which of the following scenarios can we assume a Normal distribution for the sample mean? a. Sample of size 2 comes from a population with normal distribution (known variance) b. Sample of size 10 comes from a population with normal distribution (unknown variance) c. Sample of size 300 comes from a population with some unknown distribution d. Sample of size 15 comes from a population with some unknown distribution

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