Assume all the students' quiz 2 scores in last year's class is normally distributed with mean and variance 121. Suppose we have randomly sampled three students from the last year's class and their scores were 70, 80, and 90. What is the sample mean of the three students last year's quiz 2 score?

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Assume all the students' quiz 2 scores in last year's class is normally distributed with mean  and variance 121. Suppose we have randomly sampled three students from the last year's class and their scores were 70, 80, and 90. What is the sample mean of the three students last year's quiz 2 score?

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