A survey was conducted to investigate motor fuel octane ratings of several blends of gasoline, and...

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A survey was conducted to investigate motor fuel octane ratingsof several blends of gasoline, and the following data ispresented:
88.5
98.8
89.6
92.2
92.7
88.4
87.5
90.9
94.7
88.3
90.4
83.4
87.9
92.6
87.8
89.9
84.3
90.4
91.6
91.0
93.0
93.7
88.3
91.8
90.1
91.2
90.7
88.2
94.4
96.5
89.2
89.7
89.0
90.6
88.6
88.5
90.4
84.3
92.3
92.2
89.8
92.2
88.3
93.3
91.2
93.2
88.9
91.6
87.7
94.2
87.4
86.7
88.6
89.8
90.3
91.1
85.3
91.1
94.2
88.7
92.7
90.0
86.7
90.1
90.5
90.8
92.7
93.3
91.5
93.4
89.3
100.3
90.1
89.3
86.7
89.9
96.1
91.1
87.6
91.8
91.0
91.0
Construct stem-and-leaf diagram for these data and compute thesample quartiles. (10 pts)
Compute sample median, mode, mean, variance and standarddeviation. (5 pts)
Construct a frequency distribution and histogram for theratings by using eight bins. What is the shape of the distribution?(10 pts)
On Excel

Answer & Explanation Solved by verified expert

4.2 Ratings (664 Votes)

Ans a the stem and leaf plot isStemandLeafDisplayStemunit1Statistics834SampleSize82843 3Mean9052561853Median904867 7 7StdDeviation2905202874 See Answer

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88.5	98.8	89.6	92.2	92.7	88.4	87.5	90.9
94.7	88.3	90.4	83.4	87.9	92.6	87.8	89.9
84.3	90.4	91.6	91.0	93.0	93.7	88.3	91.8
90.1	91.2	90.7	88.2	94.4	96.5	89.2	89.7
89.0	90.6	88.6	88.5	90.4	84.3	92.3	92.2
89.8	92.2	88.3	93.3	91.2	93.2	88.9
91.6	87.7	94.2	87.4	86.7	88.6	89.8
90.3	91.1	85.3	91.1	94.2	88.7	92.7
90.0	86.7	90.1	90.5	90.8	92.7	93.3
91.5	93.4	89.3	100.3	90.1	89.3	86.7
89.9	96.1	91.1	87.6	91.8	91.0	91.0