Expected Return and Standard Deviation. Assuming the following probability distribution of the possible returns, calculate the expected return (r)Þ and the standard deviation (s) of the returns....

Expected Return and Standard Deviation. Assuming the following probability distribution of the possible returns, calculate the expected return (r)Þ and the standard deviation (s) of the returns.

Probability (p_i
)                  Retain (r_i
)

0.1                                          -20%

0.2                                          5%

0.3                                          10%

0.4                                          25%