Assume that​ 20% of students at a university wear contact lenses. We randomly pick 200 students. Would it be unusual to obtain a sample proportion of​ 22%? Answer by calculating the appropriate​ z-score. Round to two decimal places when necessary.

Juanita wade's new car has an msrp of $28,902.11 including title and processing fees. the premier package which includes surround sound and dvd player costs three times the amount of the in-style package which includes leather seats and select wheels. the total cost of her new car was $34,290.08 which included the 6.5% sales tax. find the cost of the premier package to the nearest cent.