A recent report indicated a typical family of four spends $490 per month on food. Assume the distribution of food expenditures for a family of four follows the normal distribution, with a standard deviation of $90 per month.(Round your intermediate answers to 2 decimal places. Round your answers to 2 decimal places.)

a.	What percent of the families spend more than $30 but less than $490 per month on food?

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b.	What percent of the families spend less than $430 per month on food?

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c.	What percent spend between $430 and $600 per month on food?

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d.	What percent spend between $500 and $600 per month on food?

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