Find the mean (average), total absolute distance from the mean, and the mean absolute deviation from the given data set. {6,7.5,8,7,9.5,10.5,11,11,9}

Mean= (Answer should be 2 decimal places)

Total absolute distance from the mean =
(Answer should be 2 decimal places)

Mean absolute deviation (MAD) = (Answer should be 2 decimal places)

Recall that the owner of a local health food store recently started a new ad campaign to attract more business and wants to know if average daily sales have increased. historically average daily sales were approximately $2,700. the upper bound of the 95% range of likely sample means for this one-sided test is approximately $2,843.44. if the owner took a random sample of forty-five days and found that daily average sales were now $2,984, what can she conclude at the 95% confidence level?