practice exam 1 T29 completed, without, anybody, standard, practice

fionaqian

why the answer is A????? anybody can help me??thank you so much!!!

which of the statement about the normal distribution is wrong?
A. has a mean of 0 and standard deviation of 1. (why this is wrong?)
B. is completed described by the mean and the standard deviation
C. is bell-shaped, with tails extending without limit to the left and to the right

[此贴子已经被作者于2010-6-1 7:32:06编辑过]