Two months ago, the mean daily rainfall in a local city was 9.4 cm. The mean absolute deviation was 3.5 cm. Last month, the mean daily rainfall in that city was 11.5 cm, and the mean absolute deviation was 1.6 cm.
Which statement about the rainfall is true?
More rain fell two months ago than last month.
About the same amount of rain fell two months ago as last month.
Last month, the amount of rain that fell each day varied about the same as the month before.
Last month, the amount of rain that fell each day varied less than the month before.
The statement that is true about rain fall is not Last month, the amount of rain that fell each day varied about the same as the month before. The answer in this question is not Last month, the amount of rain that fell each day varied about the same as the month before.
so the answer is: The amount of rain that fell each day varied less than the month before.
I don't know the answer, that why I looked it up, but google said it's : D
More rain fell two months ago than last month, it might be wrong but i tried.
To determine which statement about the rainfall is true, we need to analyze the given information about the mean daily rainfall and the mean absolute deviation for both months.
Mean daily rainfall is a measure of the average amount of rainfall per day, while mean absolute deviation measures the average variability or spread of the daily rainfall values around the mean. A smaller mean absolute deviation indicates less variability or less spread of the data.
Let's compare the mean daily rainfall and the mean absolute deviation for both months:
Two months ago:
Mean daily rainfall = 9.4 cm
Mean absolute deviation = 3.5 cm
Last month:
Mean daily rainfall = 11.5 cm
Mean absolute deviation = 1.6 cm
Comparing the mean daily rainfall:
The mean daily rainfall was higher last month (11.5 cm) than two months ago (9.4 cm). Therefore, the statement "More rain fell two months ago than last month" is false.
Comparing the mean absolute deviation:
The mean absolute deviation was higher two months ago (3.5 cm) compared to last month (1.6 cm). This indicates that the amount of rain each day varied more two months ago than last month. Therefore, the statement "Last month, the amount of rain that fell each day varied less than the month before" is false.
To determine the correct statement, we compare the mean daily rainfall for both months:
- The statement "About the same amount of rain fell two months ago as last month" is incorrect because the mean daily rainfall was higher last month.
- The statement "Last month, the amount of rain that fell each day varied about the same as the month before" is correct because the mean absolute deviation does not show a significant difference in variability between the two months.
Therefore, the statement "Last month, the amount of rain that fell each day varied about the same as the month before" is true.