The mode is defined as the most repeated value in a data set.
You have the following data:
8, 13, 8, 3, 7
As you can observe, 8 is two times in the data, the rest of the numbers only appears once.
Then, the mode is 8.
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In order to convert yard units to feet units, you use the following conversion factor:
3 feet = 1 yard
You have the number 945 yd. To conver this number in yards to feets you proceed as follow:
945 yd (3 ft / 1 yd) = 2835 ft
That is, you multipled 945 by 3 ft and divided by 1 yd