[See] The development time for a photographic printing paper is normally distributed with mean 30 seconds and variance 1.21 seconds 2 . What is probability
Question: The development time for a photographic printing paper is normally distributed with mean 30 seconds and variance 1.21 seconds 2 .
- What is probability that the development time is at least 28.5 seconds?
- What is the probability that the development time is at most 31 seconds?
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