Stats homework help NYS

New York Stock Exchange. Suppose that the percentage returns for a given year for all
Stocks listed on the New York Stock Exchange follows a non-normal distribution with mean
µ = 11.2 percent and a standard deviation of σ = 8.4 percent.

That was given to me and I have to answer whether or not I can find the probability that a single stock has an annual return less than 34 percent? Explain why or why not.

I'm really struggling with this class and can't seem to figure out where to begin in answering this question.