2 The heights of sunflowers may be assumed to be normally distributed with a mean of 185 cm and a standard deviation of 10 cm .
- Determine the probability that the height of a randomly selected sunflower:
- is less than 200 cm ;
- is more than 175 cm ;
- is between 175 cm and 200 cm .
- Determine the probability that the mean height of a random sample of 4 sunflowers is more than 190 cm .