Samples of aluminum-alloy channels were tested for stiffness. The following frequency distribution was ob- tained. The distribution is assumed to be normal. stiffness 2480 2440 2400 2360 2320 frequency 23 35 40 33 21

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Samples of aluminum-alloy channels were tested for
stiffness. The following frequency distribution was ob-
tained. The distribution is assumed to be normal.
stiffness
2480
2440
2400
2360
2320
frequency
23
35
40
33
21
Transcribed Image Text:Samples of aluminum-alloy channels were tested for stiffness. The following frequency distribution was ob- tained. The distribution is assumed to be normal. stiffness 2480 2440 2400 2360 2320 frequency 23 35 40 33 21
14. What is the approximate standard deviation of the
population from which the samples were taken?
Transcribed Image Text:14. What is the approximate standard deviation of the population from which the samples were taken?
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