Question:

The length of sweetpea flower stems are normally distrusted with mean and standard deviation .

(a) Find the probability that the length of a flower stem is between and .

(b) of the flower stems are longer than h cm. of the flower stems are shorter than k cm. Find and .

(c) Stem lengths less than are unacceptable at a florist's shop. In a batch of sweetpeas estimate how many would be unacceptable.

Attempt:

,

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Answer in textbook is0.614

█ Don't know how to start, need help!