In a group, 10 freshmen have mean GPA of 3.5; 20 sophomores have a mean GPA of 2.9; 25 juniors have a mean GPA of 3.2; and 15 seniors have a mean GPA of 3.4. What is the mean of the entire group

Step-by-step explanation:

For this case we have the following info given:

for freshmen

for sophomores

for juniors

for seniors

For this case we can use the formula for the sample mean in order to find the total of each group:

And replacing we got:

And the grand mean would be given by:

step-by-step explanation:

one set of data has more variation than the other. hope this !