#StackBounty: #statistical-significance Calculating expected number of failures using the CDF and SF

Bounty: 50

Using a simple model, I have produced an output distribution as

rv = scipy.stats.johnsonsu(1.874, 2.324, 52.633, 1.097)

If this is a manufacturing setting, and my lower spec limit is 45 and upper spec limit is 55, I want to know the expected failure rates (x < 45 or x > 55). I can check the cumulative density function and the survival function, respectively, to perform each of the single tailed tests:

>>> rv.cdf(45)
1.035e-05
>>> rv.sf(55)
3.564e-08

Since this random variable represents an independent draw during manufacturing, if I assemble 1e6 units, should I expect none of them will be larger than 55 but 10 will be less than 45?


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