SOLUTION: The average income tax refund for the 2009 tax year was ​$2860 Assume the refund per person follows the normal probability distribution with a standard deviation of ​$958

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Question 1161476: The average income tax refund for the 2009 tax year was ​$2860

Assume the refund per person follows the normal probability distribution with a standard deviation of ​$958
What is the probability that a randomly selected tax return refund will be more than ​$1900?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
z=(x-mean)/sd
> (1900-2860)/958, which is -960/958 or -1.002
that probability is 0.8418