I would say the 5 most recent tests are a good indicator of your overall "average". There's a good chance there might be some variation over 10 PTs, for example, so really the latest five might be more accurate. However, I think it's worth considering outliers (positive or negative) as you could always have a terrible or perfect day. Your score could shift substantially compared to your "average" if this were to be the case. Nonetheless, I'd say the 5 most recent are the best estimate, in my opinion.
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I would say the 5 most recent tests are a good indicator of your overall "average". There's a good chance there might be some variation over 10 PTs, for example, so really the latest five might be more accurate. However, I think it's worth considering outliers (positive or negative) as you could always have a terrible or perfect day. Your score could shift substantially compared to your "average" if this were to be the case. Nonetheless, I'd say the 5 most recent are the best estimate, in my opinion.