Bavarian Sausages shares have an average historical return of 16.3% and a standard deviation of 5.3%. What is the probability that the return on Bavarian Sausage will be less than 11%?

a.	84%
b.	50%
c.	16%
d.	32%

ANS: C

1 0.5 0.34 = 0.16

why the answer wrote like that?

where are 0.5 and 0.34 from?

please explain clearly thank you.