The attached table shows the mean and standard deviation of the ungrouped scores corresponding to an exam that has been taken by students from three different groups A, B, and C, with 20 students in each group. The minimum score established in the exam is 0, and the maximum is 10.
Mean for group A = 4.35, B = 6.28, and C = 5.33
Standard deviation for group A = 2.37, B = 2.20, and C = 2.68
According to the provided information, the group with the most homogeneous grades is:
Accepted Solution
A:
Given the standard deviations for the three groups:
Group A = 2.37
Group B = 2.20
Group C = 2.68
The group with the lowest standard deviation is Group B with a standard deviation of 2.20.
Therefore, according to the provided information, the group with the most homogeneous grades is Group B.