Around here, that would be very low. I'd expect a "lazy", low-powered, gas-sucking engine.
In Denver, maybe that's not so bad. The way I remember it, GM spec is 100 psi or more; and within 20% of each other--but I haven't looked that up in a long time 'cause MY specs are much less lenient.
Compression pressure is affected by altitude, cranking speed, cam duration, and about two dozen other factors--INCLUDING defective or inaccurate compression tester gauges.
Since "they" did the compression test, you won't have access to the gauge to verify the accuracy. The easy way to do that is to plug them into a source of compressed air; and see if the compression tester gauge agrees with the gauge on the air compressor regulator. Most compression testers have a quick-coupler that's compatible with Milton "M"-style (Industrial Interchange) compressed air couplers.
Next step might be to perform a cylinder leakdown test.