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Under usual conditions a particular drug is known to have a pH that is normally distributed...

Under usual conditions a particular drug is known to have a pH that is normally distributed with mean 9 and variance 0.25. If pH of drug is either lower or upper 15% distribution, it is not acceptable.In a random sample of 36 different drugs, approximate the probability that more than 30 of them have acceptable pH level.

math   Statistics-And-Probability   
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