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In a specific exam students got the grades 6,7, and 8. 50 people took the exam. The average grade wa

Question: In a specific exam students got the grades 6,7, and 8. 50 people took the exam. The average grade was 7.4. We also know that 10 students got the grade 6.

A. How many students got the grade 7, and how many students got the grade 8?

B. Calculate the standard deviation.

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