Is this a fact or opinion? Explain your answer.

If two sets of data have the same mean, they must be the same set of data.

opinion

Step-by-step explanation:

2 different sets of data can have the same mean:

for example

4, 5, 6 - --> has a mean of 5

2,6,7 - --> also has a mean of 5

hence it is NOT a fact that if the means are the same, that it must be the same data set