A study was based on the records of 6789 patients in 369 hospitals in which the patients’ hearts stopped because of conditions that could have been reversed by an electrical shock from a defibrillator. Let p be the percentage of patients who survived at least until being discharged from the hospital, and let d be the delay (in minutes) in the hospital staff giving the shock. For delays from 1 to 6 minutes, inclusive, a reasonable model is p = -4.4d + 45.
a. Graph the model by hand.
b. Predict the delay for patients of which 23% survived at least until being discharged from the hospital. Explain by using arrows on the graph you sketched in part (a).