To determine a target audience for a new email package, a computer company surveyed a large sample of potential customers, asking each whether he or she uses email on a regular basis. (The company considered "a regular basis" to be at least three times a week.) The customers were classified according to two variables: age ("Under 18", "18-35", "36-54", or "+55") and email use ("On a regular basis" or "Not on a regular basis").

The respective observed frequencies are written in the cells of the contingency table below. In addition, three of the cells have blanks beneath the observed frequencies. Fill in these blanks with the frequencies expected if the two variables, email use and age, are independent.

Round your answers to two or more decimal places.

Age (in years) X ? Under 18 18-35 36-54 55+ Total On a 117 129 52 118 regular 416 basis Email use Not on a 186 159 53 186 regular 584 basis Total 303 288 105 304 1000