This calculator determines the area under the standard normal curve given z-Score values. In Microsoft Excel or Google Sheets, you write this function as =NORMINV (0.99,1000,50 Normal Distribution Calculator to Find Area, Probability From our normal distribution table, an inverse lookup for 99%, we get a z-value of 2.326. You can use the normal distribution calculator to find area under the normal curve Rearranging this formula by solving for x, we get: x = μ + zσ. It takes 4 inputs: lower bound, upper bound, mean, and standard deviation. The normal distribution calculator works just like the TI 83/TI 84 calculator normalCDF function. Normal Distribution Calculator to Find Area, Probability, Percentile Rank. ![]() ![]() Home Locating percentiles under the normal curve Calculator
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