The depth of water in Lake Wanaka is given by

D(t)=2+cos(/6t), where D is the depth, measured in meters, and t is the number of hours after 9 am.

Find the average depth between 10 am and 11amFind the average depth between 10 am and 11 am, accurate to four decimal places.

Select one:

a. 2+3(3-1)m

b. 2.6991m

c. 2.3660m

d. 2.7m

Please answer as clear as possible so that I understand! thanks