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The average income tax refund for the 2009 tax year was ​$3109. Assume the refund per...

The average income tax refund for the 2009 tax year was ​$3109. Assume the refund per person follows the normal probability distribution with a standard deviation of ​$917. Complete parts a through d below.

a. What is the probability that a randomly selected tax return refund will be more than $2000?

b. What is the probability that a randomly selected tax return refund will be between $1500 and $2900?

c. What is the probability that a randomly selected tax return refund will be between $3400 and 4000​?

d. What refund amount represents the 35th percentile of tax​ returns?

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orchestra answered 9 months ago
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