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The value of 178 psi is quoted from Web sources for that "generation" Camry. This is the "factory spec", higher is OK provided the cylinder don't vary that much, below 142 is too low.
Maybe the compression tester is only that accurate -- I heard that low-end models can read low. This one was a loaner from O'Reilly Autoparts -- it had a check valve at the bottom of the rubber tube, which is good, but it required a screw-on fitting over the bottom of the tube to match the spark plug hole on this car, which slightly increases to "clearance volume" and could lower the compression reading.
Can a tooth-ahead timing belt increase compression beyond what it should be?
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