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AP Stats

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I generally know how to use the normalcdf function on my calculator, but how to I find the area under a normal curve if there is no lower limit or no upper limit? For instance, we are required to use a calculator on this problem:

Find the area under the standard normal curve that corresponds to the z values to the left of 1.55.

The upper limit would be 1.55, but what do I put for the lower limit?

  • AP Stats - ,

    negative infinity?

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