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A random sample was taken of the thickness of insulation in transformer windings, and the following thicknesses (in millimeters) were recorded:
18
21
22
29
25
31
37
38
41
39
44
48
54
56
57
47
35
36
32
42
43
40
34
24
30
49
23
a) Make a stem-and-leaf display for these data. Show at least five stems. Sort the data on each stem in order of increasing magnitude.
b) Estimate from these data the percentage of all the windings that received more than 30 mm of insulation but less than 50 mm.
c) Find the median, lower quartile, and ninth decile of these data.
d) Make a frequency table for the data. Use Sturges' rule.
e) Draw a frequency histogram.
f) Add and label an axis for relative frequency.
g) Draw a cumulative frequency graph.
h) Find the mode.
i) Show a box plot of these data.
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Fewer than 30 individuals watched a movie at home this week ? b) More than 42 individuals watched a movie at home this week ?
Between 2 and 4 PM on Wednesday, patient insurance inquiries arrive at Blue Choice insurance with a mean rate of 2.6 calls per minute. What is the probability of waiting more than 1.5 minutes to get the next inquiry call?
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