Answer :

SOLUTION:

The z-score is gotten as;

[tex]Z=\frac{x-\mu}{\frac{\sigma}{\sqrt{n}}}[/tex]

Inserting, the values we have;

[tex]Z=\frac{7-8}{\frac{3}{\sqrt{25}}}=-1.67[/tex]

Thus, using a significance level of 0.05;

Thus, the answer is OPTION C

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