This calculator can be used to find area under standard normal curve $ ( \mu=0 , \sigma=1 )$. The normal CDF can then be used to arrive at whatever area under the standard normal curve is of interest. Trials, n, must be a whole number greater than 0. You need to set the following variables to run the normal This number represents the number of desired positive outcomes for the experiment. Compute the variance (2^22) by multiplying NNN, ppp and qqq, as 2=Npq^2 = N \times p \times q2=Npq. Still wondering if CalcWorkshop is right for you? Similarly, just over 95% of its probability density falls between -2 and +2 standard deviations. You need to set the following variables to run the normal approximation to binomial calculator. In another example, a raw score of 1600 from a distribution with mean 1000 and variance 90,000 is given. P (z<2.36) P (z>0.67) P (00. The z-value is 2.3 for the event of 60.5 (x = 60.5) occurrences with the mean of 50 ( = 50) and standard deviation of 5 ( = 5). If NpN \times pNp and NqN \times qNq are both larger than 555, then you can use the approximation without worry. Probability, 6. for (var i=0; i