Column a column b
1. (–22+17)+13 = –22+(17+13)
2. –(27+(–3)) = –27+3
3. 35+(–15+4) = (35+(–15))+4
4. –12+6 = 6+(–12)
a. commutative property
b. associative property
c. opposite of a sum property

#5 points possible: 3. total attempts: 5 using your calculator, find the range and standard deviation, round to two decimals places: the table below gives the number of hours spent watching tv last week by a sample of 24 children. 76 57 89 73 88 42 31 46 80 42 38 57 49 50 89 36 69 82 27 88 39 89 95 18 range = standard deviation =