7.28 Helmets and lunches. The scatterplot shows the relationship between socioeconomic status measured as the percentage of chil
dren in a neighborhood receiving reduced-fee lunches at school (lunch) and the percentage of bike riders in the neighborhood wearing helmets (helmet). The average percentage of children receiving reduced-fee lunches is 30.8% with a standard deviation of 26.7% and the average percentage of bike riders wearing helmets is 38.8% with a standard deviation of 16.9%. (a) If the R 2 for the least-squares regression line for these data is 72%, what is the correlation between lunch and helmet
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