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An additional research assistant has been hired to help with basic grading and statistical analyses.The new assistant is very eager, but is perplexed by the

An additional research assistant has been hired to help with basic grading and statistical analyses.The new assistant is very eager, but is perplexed by the mean calculated below.Help the new assistant debug these calculations to determine what, if anything, went awry.

Gradesffx

805400

759300

704280

655325

552275

904360

953285

1002200

n = 8 = 2425

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