The quarterly returns for a group of 68 mutual funds with a mean of ​2.8% and a standard deviation of ​6.8% can be modeled by a Normal model. Based on the model ​N(​0.028,0.068​), what are the cutoff values for the ​a) highest ​20% of these​ funds? ​b) lowest ​40%? ​c) middle ​80%? ​d) highest ​60%?

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