Answer:
B.
Explanation:
The mean refers to the computed average of all the numbers within the same group. Having the same mean between both classes means that their scores have the same average.
The standard deviation refers to the difference between the highest and lowest points of the numbers within the same group. In this case, it means that the class with a higher standard deviation has scores that have higher gaps between each other (for example, the highest score is 99 out of 100 and the lowest score is 3 out of 100).
So despite having the same computed average or mean, it can be inferred that the class with a higher standard deviation has scores that are more varied than the class with the lower standard deviation.