The accompanying frequency distribution of fracture strength (MPa) observations for ceramic bars fired in a particular kiln appeared in the article Evaluating Tunnel Kiln Performance (Amer. Ceramic Soc. Bull., Aug. 1997: 5963). Class 8183 8385 8587 8789 8991 Frequency 6 7 17 30 43 Class 9193 9395 9597 9799 Frequency 28 22 13 3 a. Construct a histogram based on relative frequencies, and comment on any interesting features. b. What proportion of the strength observations are at least 85? Less than 95? c. Roughly what proportion of the observations are less than 90?

Elementary Statistics Notes Amanda Selly August 22, 2016 Statistics: is the practice of taking data and making inferences with that data Inferential Statistics: Ex. In general students Descriptive Statistics: who are in STAT 154 are taking 14.3 credit hours Ex: the average number of credits in STAT 154-02 Unsafe and difficult to is 14.3 rely on