Question

the means and mean absolute deviations of sidneys and phils grades are shown in the table. which expression represents the ratio of the difference of the two means to sidneys mean absolute deviation?

Explanation:

Step1: Calculate the difference of the two means

The mean of Sidney's grades is \(82\), and the mean of Phil's grades is \(78\). The difference of the two means is \(82 - 78=4\).

Step2: Form the ratio

The ratio of the difference of the two means to Sidney's mean absolute deviation. Sidney's mean absolute deviation is \(3.28\). So the ratio is \(\frac{4}{3.28}\).

Answer:

\(\frac{4}{3.28}\)