Noooo, that’s not true. Below 100, as it’s weighted for this to be true: half above half below. It could theoretically be possible for the half below to also be below 50, but this would require the other half to all be above 150, and both are absurd, because there are a whole horde of people of completely average intelligence.
Checking IQ test results, we see they follow a Gaussian with a mean of 100 and a stddev of 15.
