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The WEIBULL.DIST function is one of the statistical functions. It is used to return the Weibull distribution. Use this distribution in reliability analysis, such as calculating a device's mean time to failure.

The WEIBULL.DIST function syntax is:

WEIBULL.DIST(x, alpha, beta, cumulative)


x is the value between at which the function should be calculated, a numeric value greater than or equal to 0.

alpha is the first parameter of the distribution, a numeric value greater than 0.

beta is the second parameter of the distribution, a numeric value greater than 0.

cumulative is a logical value (TRUE or FALSE) that determines the function form. If it is TRUE, the function returns the cumulative distribution function. If it is FALSE, the function returns the probability density function.

The values can be entered manually or included into the cells you make reference to.

To apply the WEIBULL.DIST function,

  1. select the cell where you wish to display the result,
  2. click the Insert function
    icon situated at the top toolbar,
    or right-click within a selected cell and select the Insert Function option from the menu,
    or click the
    icon situated at the formula bar,
  3. select the Statistical function group from the list,
  4. click the WEIBULL.DIST function,
  5. enter the required arguments separating them by commas,
  6. press the Enter button.

The result will be displayed in the selected cell.


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