anonymous
  • anonymous
The heights of a certain species of plant are normally distributed, with mean 20 cm and standard deviation 2cm. What is the probabilty that a plant chosen at random will be between 19 & 21 cm tall?
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
There is a 38.29% chance of the plant being 19 to 21 cm tall. This is found using the Normal CDF function on a TI89 in the stats/list editor. If use choose F5->Normal CDF->and then enter "Lower Value = 19", "Upper Value = 21", mean = "20" and S.D.="2" you will get this result. Otherwise you need to use a z-table.

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