For each conjecture, state the null and alternative hypotheses.

a. The average weight of dogs is 15.6 pounds.

b. The average distance a person lives away from a toxic waste site is greater than 10.8 miles.

c. The average farm size in 1970 was less than 390 acres.

d. The average number of miles a vehicle is driven per year is 12,603.

e. The average amount of money a person keeps in his or her checking account is less than $24.