10. Consider the IQ data given in Example 1.2.

a. Construct a stem-and-leaf display of the data.

What appears to be a representative IQ value?

Do the observations appear to be highly concentrated about the representative value or rather spread out?

b. Does the display appear to be reasonably symmetric about a representative value, or would you describe its shape in some other way?

c. Do there appear to be any outlying IQ values?

d. What proportion of IQ values in this sample exceed 100?