The average income tax refund for the 2009 tax year was $2945. Assume the refund per person follows the normal probability distribution with a standard deviation of $955. Complete parts a through d below a. What is the probability that a randomly selected tax return refund will be more than $2400? 0.7157 (Round to four decimal places as needed.) b. What is the probability that a randomly selected tax return refund will be between $1400 and $28007 0.3868 (Round to four decimal places as needed.) c. What is the probability that a randomly selected tax retum refund will be between $3100 and $4500? (Round to four decimal places as needed.)