A monthly income investment scheme exists that promises variable monthly returns . An investor will invest in it only if he is assured of an average $ 180 monthly income . He has a sample of 300 months ' returns which has a mean of $ 190 and a standard deviation of $ 75 . ? Should he or she invest in this scheme
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32} \] \[ z = \frac{-10}{4.33} \] \[ z = -2.31 \] ** Show more…
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