Let X denote the amount of space occupied by an article placed in a one-cubic-foot packing container. The pdf of X is f left parenthesis x right parenthesis equals 90 x to the power of 8 left parenthesis 1 minus x right parenthesisfor 0 less than x less than 1 and f left parenthesis x right parenthesis equals 0 otherwise. Find P left parenthesis X less or equal than 0.5 right parenthesis. Round to four decimal places