After 1 hour >> 44 miles apart
after 2 hours >> 88 miles apart
after 2.5 hours >> 110 miles apart
Two and a half hours
The average temperature for July over the past 30 years in Eloy and Arizona is 90°. The standard deviation is 2.1°. This implies that the temperature over these 30 years spans from 90° - 2.1° to 90° + 2.1°, which equals 87.9° to 90°. The average for the last five summers in Eloy and Arizona is 92°. To calculate the reduction, which is 2.5% from 92, we find that 89.70° is within the 87.9° to 90° range. Thus, it can be concluded that the two averages are likely identical.
9+9+9+9+9=45. I'm unsure if that is what they want.
