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The average income tax refund for the 2009 tax year was $3049. Assume the refund per person follows the normal probability distribution with a standard deviation of $900. Complete parts a through d below. a. What is the probability that a randomly selected tax return refund will be more than $2000? (Round to four decimal places as needed.) b. What is the probability that a randomly selected tax return refund will be between $1700 and $2100? (Round to four decimal places as needed.) c. What is the probability that a randomly selected tax return refund will be between $3000 and $3900? (Round to four decimal places as needed.) d. What refund amount represents the 35th percentile of tax returns? $(Round to the nearest dollar as needed.)