The mean daily temperature is indeed 68.4°F. The correct answer is A. 68.4°F.
To find the mean (average) daily temperature, you'll need to sum up all the
temperatures and then divide by the number of days.
Sum of temperatures:
61 + 77 + 81 + 52 + 81 + 61 + 77 + 61 + 81 + 52 = 684
Number of days (which is 10 in this case)
Now, divide the sum of temperatures by the number of days:
684 (sum of temperatures) / 10 (number of days) = 68.4
So, the mean daily temperature is indeed 68.4°F. The correct answer is A. 68.4°F.