Returns the inverse of the cumulative beta probability density function for a specified beta distribution (BETADIST).
| Name | Type | Description |
| arg1 | number | A probability associated with the beta distribution. |
| arg2 | number | The alpha parameter of the distribution which must be greater than 0. |
| arg3 | number | The beta parameter of the distribution which must be greater than 0. |
| arg4 | number | An optional lower bound to the interval of x (A). If omitted, it is equal to 0. |
| arg5 | number | An optional upper bound to the interval of x (B). If omitted, it is equal to 1. |