The difference between the means of the Andre's and Mandy's classes are 1.42. [tex]X_{AM}=1.42X_{MM}[/tex]
What is mean?
The "mean" is the "average" you're used to, where you add up all the numbers and then divide by the number of numbers.
From the data given we will calculate the mean of andres's class students and mandy's class students.
For Andre's
[tex]X_{AM}=\dfrac{20+21+22+23+25}{5}=22.5[/tex]
For Mandy
[tex]X_{MM}=\dfrac{14+15+15+16+19}{5}=15.8[/tex]
So here we will compare the means
[tex]\dfrac{X_{AM}}{X_{MM}}=\dfrac{22.5}{15.8}=1.42[/tex]
[tex]X_{AM}=1.42X_{MM}[/tex]
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