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12 September, 04:39

determine the area under the standard normal curve that lies to the left of (a) z=0.92 (b) z=-1.26 (c) z = - 0.64 (d) z = - 1.09

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  1. 12 September, 05:04
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    Your main choices here are (1) a calculator with statistical functions and (2) a table of z-scores.

    (a) On my TI-83 Plus calculator I typed in normcdf (-1000, 0.92). The calculator returned the value 0.821. This is approx. 8/10 of the total area under the std normal curve.

    (b) I typed in normcdf (-1000, - 1.26) and got 0.104

    (c) I typed in normcdf (-1000, - 0.64) and got 0.261

    (d) I typed in normcdf (-1000, - 1.09) and got 0.138
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