Any number that is less than 27.06 would cause you to shut down production.
The calculation can be done as follows:
Probability of correctly made product = 90.2%
Probability of NOT correctly made product = 100% - Probability of correctly made product = 100% - 90.2% = 9.80%
Number of products in the batches being tested = 30
The average number of products NOT correctly made = Probability of NOT correctly made product * Number of products in the batches being tested = 9.80% * 30 = 2.94
The average number of products correctly made = Probability of correctly made product * Number of products in the batches being tested = 90.2% * 30 = 27.06
Since the average number of products correctly made is 27.06, any number that is less than 27.06 would cause you to shut down production.
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