Choose all the equations which are correctly solved. x^2– 5x + 5 = 0 {2,3}

x^2 – 7x - 8 = 0 {-1, 8}

x^2 + 12x + 20 = 0 {-2, -10}

x^2 – 3x – 10 = 0 {2, 10}

x^2 + x + 20 = 0 {4,5}

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).