SOLUTION: 69% of new cars purchased in Australia have automatic transmission. Find the probability that less than 40 new cars from a random sample of 50 have automatic transmission.

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Question 970171: 69% of new cars purchased in Australia have automatic transmission. Find the probability that less than 40 new cars from a random sample of 50 have automatic transmission.




Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
This is a one sample proportion test
SD= sqrt {0.69 *0.31/50} = 0.0654
z= .80-.69/0.0654
z=1.681
Prob > than that is 0.097
Probability < than that is 0.903.