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Hi please review my homework( only 3 questions) to make sure I answered them correctly( especially if I used the right formula and explanation 1)A

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Hi please review my homework( only 3 questions) to make sure I answered them correctly( especially if I used the right formula and explanation

1)A student claims that the mean age of the students at his school is less than 25.A random sample of 300 of his students had a mean age of 24.1 years old with a standard deviation of 8.13 years.Do a hypothesis test and test this claim at the 0.05 level of significance.

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The null and alternative hypotheses Ho = S Ho

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