Heating and combustion analyses were performed in order to study the composition of moon rocks. Recorded here are the determinations of hydrogen (H) and carbon (C) in parts per million (ppm) for 11 specimens.

Hydrogen (ppm)	120	82	90	8	38	20	2.8	66	2.0	20	85
Carbon (ppm)	105	110	99	22	50	40	7.3	74	7.7	45	51

Calculate r. Round your answer to three decimal places.