A manufacturer of printers for personal computers wishes to estimate the mean number of characters printed before the print-head fails. The printer manufacturer testsa random sample of 14 printers and records the number of characters printed until failure for each. The data below represents the number of characters until failure for each of the 14 printers (in millions of characters:

1.141.541.420.931.241.371.33

0.861.090.881.191.171.231.29

Find the sample mean. Answer to four decimal places.