High School

The length of rose stems follows a normal distribution with a mean length of 18.12 inches and a standard deviation of 3.253 inches. A flower shop sells roses as parts of wedding flowers, wedding bouquets, and corsages. Please use this information to answer the following questions.

A) What is the probability that a given rose stem will be shorter than 16.6 inches?

B) Suppose a rose is considered a 'long stem rose' if its stem length is longer than 21.7 inches. What is the probability that a given rose will be considered a long stem rose?

C) The flower shop has a rule that the shortest 8% of roses are clipped and used as corsages. What is the maximum stem length (in inches) that a rose can be and still qualify to be used as a corsage by the shop?

D) Suppose the z-score (standardized score) of a rose stem length is 0.64. Which of the following statements is a correct interpretation of the meaning of this value?

Answer :

The answer explains the probability of rose stem lengths, including being shorter or longer than certain lengths, determining maximum length for corsages, and interpreting z-scores.

A) To find the probability that a rose stem will be shorter than 16.6 inches, we calculate the z-score and use the standard normal distribution table.

B) For the probability of a rose being a 'long stem rose' (>21.7 inches), we find the z-score and use the standard normal distribution table.

C) To determine the maximum stem length for corsages, we find the z-score corresponding to the 8th percentile.

D) A z-score of 0.64 means the rose stem length is 0.64 standard deviations above the mean.