3. A sample of 250 auto drivers selected from New York showed that they pay on average $152 auto insurance premium per month with a standard deviation of $38. Make a 98% confidence interval for
the mean monthly auto insurance premium paid by all New York auto drivers.
4. After 784 people were used an inhaler for respiratory issues, 430 experienced mild side effects.
What is the sample mean

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?