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The U.S. Federal Reserve System publishes data on family income based on its Survey of Consumer Finances. When the head of the household has a

San Francisco, US

The U.S. Federal Reserve System publishes data on family income based on its Survey of Consumer Finances.  When the head of the household has a university degree, the mean pre-tax family income is $85,200.  Suppose that 60% of the pre-tax family incomes when the head of the household has a university degree are between $75,600 and $94,800 and that these incomes are normally distributed.  What is the standard deviation of pre-tax family incomes when the head of the household has a university degree? Z1 Score = ?   ( Need Excel Function to calculate Zscore Z2 Score= ?    (Need excel Function to Calculate z Score St Dev= ?      (Show the formula that you use to calculate the St Dev

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