Based on the given table, the mean grade of Sidney is 82, and the mean grade of Phil is 78. Moreover, the mean absolute deviation of Sidney is 3.28, and the mean absolute deviation of Phil is 3.96.
To find the difference between the two means, we just need to subtract the means of their grades. That is 82-78 or 4.
Therefore, the ratio of the difference of the two means to Sidney’s mean absolute deviation is [tex]\frac{4}{3.28}[/tex] or [tex]\frac{50}{41}[/tex] or 1.2195.
