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Drivers in Alaska drive fewer miles yearly than motorists in any other state. The annual number of miles driven per licensed driver in Alaska is 9154 miles. Assume the standard deviation is 3100 miles. A random sample of 400 licensed drivers in Alaska is selected and the mean number of miles driven yearly for the sample is calculated. a. What value would we expect for the sample mean? b. What is the standard error for the sample mean? ..... a. The expected sample mean is miles, because the (Round to the nearest integer as needed.) b. What is the standard error for the sample mean? The standard error for the sample mean is miles. sample mean is an unbiased estimator of the population mean. (Type an integer or decimal rounded to the nearest tenth distribution is right-skewed. distribution is left-skewed. sample mean gets smaller with a larger sample size. sample mean gets larger with a larger sample size