Question

Please help!

Answer 1

Grey Kangaroos are large, social marsupials, indigenous to Australia. The Eastern Greys are a light grayish brown, while the Western Grey is a copper brown color. As part of a study of the development of these creatures, biologists have measured various aspects of their skeletal structure. A sample of 124 palate widths was taken from skeletal remains and the data is presented in the stem-and-leaf plot below. The distributions of skeletal measures are generally thought to be approximately normal, which is consistent with the stem-and-leaf plot for this sample. The display uses five lines for each stem. Thus, "2t|" is the stem for palate widths of 22 and 23, "2f|" for 24 and 25, "2s|" for 26 and 27, and so on. (The "t" then stands for leaves that are twos and threes, the "f" for leaves of fours and fives, etc.) The mean palate width of this sample is 2.6 cm, and the standard deviation is 0.3 cm.

Answer 2

Assess the normality of the data as it pertains to the empirical rule. Be sure to show your calculations and thinking.


This is what I have (the empirical rule): The empirical rule states that approximately 68% of the cases in a normal distribution fall within one standard deviation of the mean, 95% of the cases in a normal distribution fall within two standard deviations of the mean, and 99.7% of all cases fall within three standard deviations of the mean.

I don't know how to apply it.

Answer 3

@ganeshie8