Question 4                                                                                                                         The length of a fully grown hibiscus plant is normally distributed and has a mean 35cm. It is found that 5% of these plants are longer than 45cm. Find the standard deviation σ.                                                                                     When plants are chosen for sale, those shorter than 30cm are rejected. Find the probability that a plant will be rejected.                                                Could the standard normal table be used to solve this question?

Question

Question 4                                                                                                                        

The length of a fully grown hibiscus plant is normally distributed and has a mean 35cm. It is found that 5% of these plants are longer than 45cm.

  1. Find the standard deviation σ. 

                                                                                  

  1. When plants are chosen for sale, those shorter than 30cm are rejected. Find the probability that a plant will be rejected.                                                Could the standard normal table be used to solve this question?

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