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Probability Math Problem Help?
Suppose that 18% of people that enter a car dealership buy a car that day from that dealer. What is the probability that least 14% of the 150 customers that enter the dealership this week buy a car from the dealer?
1 Answer
- LeonardLv 78 years agoFavorite Answer
Under the assumption of independence,
we have p=.18 and std error(p)=sqrt[(.18)(1-.18)/150)]=.0314.
So Z=(.14-.18)/.0314= -1.27.
From the normal dist., the area to the right of -1.27 is .898
