Please help me understand this better

A county is considering raising the speed limit on a road because they claim that the mean speed of vehicles is greater than 35 miles per hour. A random sample of 15 vehicles has a mean speed of40 miles per hour and a standard deviation of 4.7 miles per hour. At 0: :0.10. do you have enough evidence to support the county's claim? Write the claim mathematically and identify Ho and H3. Choose the correct answer below. 0 Ho: p: S 35 Ha: p. > 35 (claim) 0 H0: [1. > 35 (claim) Ha: ,u S 35 0 Ho: pl : 35 (claim) Ha: ,u 75 35 O Ho: ,u