Please answer each question. In order to receive full credit, the correct answer must be given along with sufficient supporting work. Partial credit may be awarded based on work shown. 1. Of all...

solve 1 a,b and c

Extracted text: Please answer each question. In order to receive full credit, the correct answer must be given along with sufficient supporting work. Partial credit may be awarded based on work shown. 1. Of all customers purchasing automatic garage-door openers, 57% purchase a chain-driven model. Let X = the number among the next 15 purchasers who select the chain-driven model. a. Calculate P(X > 10). b. Calculate P(8 < 12).="" c.="" calculate="" the="" variance="" of="" this="">