Which are the correct null and alternative hypotheses? O a. Ho: The average grade of the students is equal to 90. Ha: The average grade of the students is less than 90. O b. Ho: The average grade of the students is less than 90. Ha: The average grade of the students is equal to 90. O c. Ho: The average grade of the students is greater than 90. Ha: The average grade of the students is greater than 90. O d. Ho: The average grade of the students is not equal to 90. Ha: The average grade of the students is not equal to 90.

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