Changes

*This distribution is the continuous probability distribution.It is also called Gaussian distribution.  

*This distribution is the continuous probability distribution.It is also called Gaussian distribution.  

*In <math> NORMDIST(x,m,sd,cu) ,x</math> is the value of the function,<math> m</math> is the arithmetic mean of the distribution, <math>sd</math> is the standard deviation of the distribution and <math>cu</math> is the logical value that indicating the form of the function.  

*In <math> NORMDIST(x,m,sd,cu) ,x</math> is the value of the function,<math> m</math> is the arithmetic mean of the distribution, <math>sd</math> is the standard deviation of the distribution and <math>cu</math> is the logical value that indicating the form of the function.  

*Suppose cu is TRUE, this function gives the cumulative distribution, and it is FALSE, this function give the probability mass function.  

*Suppose cu is TRUE, this function gives the cumulative distribution, and it is FALSE, this function gives the probability mass function.  

*The equation for the normal distribution is: <math> f(x,\mu,\sigma)=\frac{1}{\sigma \sqrt{2\pi}}.e^-\left({\frac{(x-\mu)^2}{2\sigma^2}}\right)</math>, where <math>\mu</math> is the mean of the distribution,<math>\sigma</math> is the standard deviation of the distribution.  

*The equation for the normal distribution is: <math> f(x,\mu,\sigma)=\frac{1}{\sigma \sqrt{2\pi}}.e^-\left({\frac{(x-\mu)^2}{2\sigma^2}}\right)</math> where <math>\mu</math> is the mean of the distribution,<math>\sigma</math> is the standard deviation of the distribution.  

*In this formula, Suppose  <math>\mu</math> = 0 and <math>\sigma</math>= 1, then the distribution is called the standard normal distribution or the unit normal distribution.

*In this formula, Suppose  <math>\mu</math> = 0 and <math>\sigma</math>= 1, then the distribution is called the standard normal distribution or the unit normal distribution.

*This function will return the result as error when  any one of the argument is nonnumeric and sd<=0.

*This function will return the result as error when  any one of the argument is nonnumeric and sd<=0.

when cu is TRUE , this formula is the integral from -infinity to x and cu is FALSE , we can use the same formula.

when cu is TRUE , this formula is the integral from -infinity to x and cu is FALSE , we can use the same formula.