An instructor calculated the average score and the sample standard deviations of the scores of his class and used the following grading scale: A At least 2 standard deviations above the mean B Between 1 and 2 standard deviations above the mean C Within one standard deviation of the mean D Below one standad deviation of the mean [YOU HAVE ONLY ONE TRY FOR THIS QUESTION] When the grades were announced the students were unhappy and he proposed the following alternative: Add 10 points to each student again calculate the mean and s for the new scores and then follow the same scheme. ✓Do you think this scheme will improve the grades??

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