Question: The answer is 4.05% but i dont know how to get that answer. I have a HP 10bll + Financial Calculator but i dont know

The answer is 4.05% but i dont know how to get that answer. I have a HP 10bll + Financial Calculator but i dont know how to put this into the calculator. PLEASE HELP!!
Question 20 Consider the following returns and states of the economy for TZ.Com. Economy ProbabilityReturn Weak 40% 2% Normal 50% 8% Strong 10% 15% What is the standard deviation of TZ's returns? 4.49% 4.60% 4.99% 4.85% 4.05%
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