Which of the following describe a set of data whose histogram approximates
a normal curve?
check all that apply.
o
a. most of the observations are near the mean of the data set.
b. the observations trail off at values far from the mean.
o
c. the histogram of the data is exactly the same as the normal
curve
o
d. the sum of the data values must be 1
e. all of the data values have to be positive.