2.68 Long-Stemmed Roses A strain of long-stemmed roses has an approximate normal distribution with a mean stem

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2.68 Long-Stemmed Roses A strain of long-stemmed roses has an approximate normal distribution with a mean stem length of 38 cm and standard deviation of 5.5 cm.

a. If one accepts as "long-stemmed roses" only those roses with a stem length greater than 38 cm, what percentage of such roses would be unacceptable?

b. What percentage of these roses would have a stem length between 31 and 51 centimetres?

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