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2. a mathematics teacher in senior high school developed a problem-solving test for randomly selected 40 grade 11 students. these students had an average score

2. a mathematics teacher in senior high school developed a problem-solving test for randomly selected 40 grade 11 students. these students had an average score of 85 and a standard deviation of 5. if the population had a mean score of 90 and a standard deviation of 3, use 5% level of significance to test the hypothesis.

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