The historical average return for Dahyun Stock is 10.7%. The historical standard deviation is 21.5%. Based on those numbers answer the following for Dahyun Stock:

a. About two in three years, your return should fall inside the range of ____% to _____%.

b. About one in twenty years, your return should fall outside the range of _____% to _____%.

c. About one in two hundred years, your return should be greater than _____%.