Assuming that the returns from holding small company stocks are normally distributed, what is the approximate probability

Question:

Assuming that the returns from holding small company stocks are normally distributed, what is the approximate probability that your money will double in value in a single year? What about triple in value?

Stocks
Stocks or shares are generally equity instruments that provide the largest source of raising funds in any public or private listed company's. The instruments are issued on a stock exchange from where a large number of general public who are willing...