4. Mean Commuting Time A sociologist wants to find the mean commuting time for all working U.S. residents. She knows that it is not practical to survey each of the millions of working people, so she conducts an Internet search and finds the mean commuting time for each of the 50 states. She adds those 50 times and divides by 50. Is the result likely to be a good estimate of the mean commuting time for all workers?

Why or why not?

In Exercises 5–12, find the

(a) mean,

(b) median,

(c) mode, and

(d) midrange for the given sample data. Also, answer the given questions.