1.A random sample of81 cars traveling on Interstate Highway I-78produced a mean of 60 miles per hourand a standard deviation of 10 miles per hour.The point estimate for the mean, in miles per hour, of the underlying population is:

59

80

60

81

A random sample of size 49 is drawnfrom a normalpopulation with a mean of 63 and standard deviation of 14. What are themean and standard deviation of the sampling distribution of the sample mean x?

= 49 and= 14

= 63 and= 14

= 63 and= 2

= 49 and=2