In a local university, 80% of the students live in the dormitories. A random sample of 80 university students is selected to participate in a particular study. What is the probability that the sample proportion (the proportion living in the dormitories) is between 0.70 and 0.85?

answer: about 22.67

step-by-step explanation:

let y equal to

the total fare and x is the mile of taxi ride. so the equation is

y = 0.55x + 1.75

since susie has

$10 to spend for a taxi cab, so he can have

10 = 0.55x +

1.75

x = 15 miles of

taxi ride

so the system of

inequality is

10 < 0.55x +

1.75

x > 2