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$1.00 Probability Urgent & Simple: Assume that the mean SAT score in Mathematics for 11th graders across the nation is 500

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Q. Assume that the mean SAT score in Mathematics for 11th graders across the nation is 500, and that the standard deviation is 100 points. Find the probability that the mean SAT score for a randomly selected group of 150 11thgraders is between 480 and 520. 

Here is my Answer so far..

μ = 500, σ = 100, n = 150

z = (x-bar - μ)/(σ/√n)

For x-bar = 480, z = (480 - 500)/(100/√150) = -2.4494

For x-bar = 520, z = (520 - 500)/(100/√150) = 2.4494
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P(480 < x-bar < 520) = P(-2.4494 < z < 2.4494) =
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Please complete the Last step.

Thanks

Note: ignore the above 2 html lines..donno how it came..