![]() ![]() ![]() Your answer should be a z-score of 1.805 that has. Since you are asked to round to 3 decimal places, then your answer would be 1.805 either way. In fact, they are the same when rounded to 4 decimal places. Regardless, both methods will get you an answer that is perfectly acceptable. The reason is that the interpolation is a straight line interpolation, whereas the calculator is looking at the actual curve itself between the two z-scores, which is not a straight line. That's not exactly equal to 1.805477458, but it's pretty close. If you were to use the z-score normal distribution tables, you would do the following: I used the ti-84 plus calculator to get the more detailed answer. This can be seen visually as shown below: 9645 of the area under the normal distribution curve to the left of it would be z = 1.805477458. You can put this solution on YOUR website!
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