Answer: The mean yearly rainfall in Sydney, Australia, is 137 mm with a standard deviation of 69 mm, indicating a normal distribution. This means that most of the rainfall data falls within 69 mm above or below the average of 137 mm. Assuming a normal distribution, approximately 68% of the data falls within one standard deviation of the mean, 95% falls within two standard deviations, and 99.7% falls within three standard deviations.
Step-by-step explanation:
