Explain whether distribution is approximated by normal curve

Reference no: EM13113211

State police believe that 70% of the drivers traveling on a major interstate highway exceed the speed limit. They plan to set up a radar trap and check the speeds of 80 randomly selected cars.

a) What is the mean and standard deviation of the sampling distribution for sample proportions?
b) Can this distribution be approximated by a normal curve?

Reference no: EM13113211

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