In-Class Exercises

1
In-Class Exercises

• 4-135. Without an automated irrigation system,
  the height of plants two weeks after germination
  is normally distributed with a mean of 2.5
  centimeters (cm) and a standard deviation of 0.5
  cm.
• What is the probability that a plants height two
  weeks after germination is greater than 2.25 cm?
• What is the probability that a plants height two
  weeks after germination is between 2.0 cm and
  3.0 cm?
• What height is exceeded by 90 of the plants?

2
In-Class Exercises

• 4-136. Continuation of Exercise 4-135. With an
  automated irrigation system, a plant grows to a
  height of 3.5 cm two weeks after germination.
• What is the probability that a plants height two
  weeks after germination is greater than 3.5 cm in
  Exercise 4-135?
• Do you think the automated irrigation system
  increases the plant height at two weeks after
  germination?