SOLUTION: At a car dealer, the average sale price of the car is $21,500 with a standard deviation of $2,750. The dealer has 9,000 cars on the lot. A) How many cars are priced at most $22,30

Algebra ->  Probability-and-statistics -> SOLUTION: At a car dealer, the average sale price of the car is $21,500 with a standard deviation of $2,750. The dealer has 9,000 cars on the lot. A) How many cars are priced at most $22,30      Log On


   

Question 607981: At a car dealer, the average sale price of the car is $21,500 with a standard deviation of $2,750. The dealer has 9,000 cars on the lot.
A) How many cars are priced at most $22,300?
B) How many cars are priced between $15,500 and $18,100?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi

standard deviation cannot be $2,750. If it were 275, for example:

z+=%2822300+-+21500%29%2F%28275%2Fsqrt%289000%29%29

 P( ≤ to 22,3000) = P( z≤ .0366) = NORMSDIST(0.0366)= .5146

  .5146*9000= 4631 cars