The world's global score is 82. This is 12th percentile rank on the Greenwich Mean Intelligence benchmark of IQ 100. As school teachers used to say in end of year reports: "Could do better".
What does IQ 82 mean in practical terms? The account below gives the achievements as shown in Western economies, with free education and usually free healthcare, and will need to be adjusted for other economies, probably downwards to account for poorer educational systems and the burdens of ill health.
Here, in broad terms, are descriptions of those in the IQ 75 (5th percentile) to IQ 90 (25th percentile) range.