How many cooling degrees days do you have with a high of 90° F and a low of 60° F? 5 10 20 30 60

10

Explanation:

To solve this, we have to first calculate the mean of the temperature. This will be:

= (90 + 60)/2

= 150/2

= 75°

Since the mean that we got is above 65°, we would then subtract it from 75° in order to get the number of cooling degree days. This will be:

= 75 - 65

= 10

d is the logical answer but im not a 100% sure