Sierra and alek each have five cousins. their ages are listed below. sierra’s cousins: 2, 11, 12, 13, 15 alek’s cousins: 9, 11, 11, 12, 13 which of the following statements is true? a. for both sets of data, the median is equal to the mean. b. the ages of sierra's cousins are more spread out than those of alek's cousins. c. the mean age of sierra's cousins is greater than that of alek's cousins. d. there are no outliers.

Given: ab ≅ cd and ad ≅ bc prove: abcd is a parallelogram. statements reasons 1. ab ≅ cd; ad ≅ bc 1. given 2. ac ≅ ac 2. reflexive property 3. △adc ≅ △cba 3. ? 4. ∠dac ≅ ∠bca; ∠acd ≅ ∠cab 4. cpctc 5. ∠dac and ∠bca are alt. int. ∠s; ∠acd and ∠cab are alt. int. ∠s 5. definition of alternate interior angles 6. ab ∥ cd; ad ∥ bc 6. converse of the alternate interior angles theorem 7. abcd is a parallelogram 7. definition of parallelogram what is the missing reason in step 3? triangle angle sum theorem sas congruency theorem sss congruency theorem cpctc