Question: A certain type pine tree has a mean diameter of 300 cm and a standard deviation of 60 cm. Diameters can be modeled with normal

A certain type pine tree has a mean diameter of 300 cm and a standard deviation of 60 cm.

Diameters can be modeled with normal distribution.

  1. What percent of these trees have a diameter less than 480cm?
  2. What percent of these trees have a diameter greater than 420cm?
  3. What percent of these trees have a diameter between 240 and 360 cm?

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