The dot plot below shows the average fuel efficiency of a number of mid- size sedans for a particular year model. the variability of each year model's average miles per gallon is 1.68. the difference between the median miles per gallon each year model's line up is approximately how many times the variability? a. 4 b. 7 c. 6 d. 3

The line y = x + passes through (−3, 7) and is parallel to y = 4x − 1.

An optical inspection system is used to distinguish among different part types. the probability of a correct classification of any part is 0.92. suppose that three parts are inspected and that the classifications are independent. let the random variable x denote the number of parts that are correctly classified. determine the probability mass function of x. round your answers to four decimal places (e. g. 98.7654). x f(x) 0 1 2 3

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).