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A sample of 300 white pine needle lengths yields an average of 10.2 cm. The standard deviation is 1.3 cm. If these samples were collected

A sample of 300 white pine needle lengths yields an average of 10.2 cm. The standard deviation is 1.3 cm. If these samples were collected randomly in Southern Ontario, find the probability that a needle is:

a) Shorter than 8 cm

b) Longer than 14 cm

c) Between 9 and 10 cm

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