= standard deviation of returns
= mean of returns
z (at X=-4%) = (-4-12)/8 = -2
z (at X=28%) = (28-12)/8 = 2
From the z-table, value at z=2 is 0.9772 (z-table for negative z-score) and at z=-2 is 0.0228 (z-table for positive z-score)
From the z-table, the area under the normal distribution = 0.9772-0.0228 = 0.9544
Hence the probability that the stock will produced a return between -4% and 28% is 0.9544.
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