Marjorie's friends bought CDs for $12, $14, $18, $10, $14, $12, $12, and $12. Which measure, mean, median or mode, best describes the cost of the CDs? Explain your reasoning. Help me please! This is a missing assignment and I cant figure it out.

Atextile fiber manufacturer is investigating a new drapery yarn, which the company claims has a mean thread elongation of 12 kilograms with a standard deviation of 0.5 kilograms. the company wishes to test the hypothesis upper h subscript 0 baseline colon mu equals 12 against upper h subscript 1 baseline colon mu less-than 12 using a random sample of n equals 4 specimens. calculate the p-value if the observed statistic is x overbar equals 11.8. round your final answer to five decimal places (e.g. 98.76543).