The accompanying frequency distribution of
Chapter 1, Problem 65(choose chapter or problem)
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: 59–63).
\(\begin{array}{lcccccc}\text { Class } & 81-<83 & 83-<85 & 85-<87 & 87-<89 & 89-<9 \\ \text { Frequency } & 6 & 7 & 17 & 30 & 43 \\ \text { Class } & 91-<93 & 93-<95 & 95-<97 & 97-<99 \\ \text { Frequency } & 28 & 22 & 13 & 3\end{array}\)
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 ?
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