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Profit of firms active in industry A follows an approximately normal distribution with mean of $10 billion and standard deviation of $5 billion

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Profit of firms active in industry A follows an approximately normal distribution with mean of $10 billion and standard deviation of $5 billion. A tax cut schedule is passed to support loss-making firms in this industry. What proportion of firms in industry A qualify to benefit from the tax cut? Select one: a. 16% O b. 5% O c. 95% d. 2.5% O O e. 1%
Suppose the rates of return on stocks in a large portfolio had a symmetric, mound-shaped distribution, with a mean of 20% and a standard deviation of 10%. Roughly what proportion of the stocks had a negative return? Select one: O a. 2.5% O b. 5% O C. 16% o d. 32% e. 68%