One cubic foot is 7.48052 US Gallons (6.22883 UK Gallons)
32x31x30x29, or 863040. Considering that repeating numbers are not allowed, if they are it's 32x32x32x32 or 1,048,576...you'll win slightly less than what you spend if you're looking at the Pick 4! Lotteries, like casinos have the numbers on their side.
Yes, the range gives you an idea of the S.D. Assuming that the largest and smallest data points are not "outliers," a set of data with a wide range will have a greater S.D. than a set with a narrow one.
In your letter It would be correct to say, "In your letter you mentioned that..." or "I spilled coffee on your letter."