Treasury bill returns are 4%, 3%, 2%, and 5% over four years. the standard deviation of returns

of treasury bills is

a) 1.55%

b) 1.03%

c) 0.90%

d) 1.29%

Option (D) 1.29%

Explanation:

Data provided in the question:

Treasury bill returns over four years :

4%, 3%, 2%, and 5%

Now,

Average return = (4% + 3% + 2%+ 5%) ÷ 4

= 3.5%

Standard deviation = [ ∑(Return - Mean)² ] ÷ [ n -1 ]

= [ (4% - 3.5%)² + (3% - 3.5%)² + (2% - 3.5%)² + (5% - 3.5%)² ] ÷ [ 4 - 1 ]

= 3.87% ÷ 3

= 1.29%

Hence,

Option (D) 1.29%

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