**Transcription for Educational Website****Sample Analysis of Aluminum-Alloy Channels**Samples of aluminum-alloy channels were tested for stiffness. The following frequency distribution was obtained. The distribution is assumed to be normal.| **Stiffness** | **Frequency** ||---------------|---------------|| 2480 | 23 || 2440 | 35 || 2400 | 40 || 2360 | 33 || 2320 | 21 |**Question:**What is the approximate mean of the population from which the samples were taken?- [ ] 2367- [ ] 2398- [ ] 2402- [ ] 2419**Explanation:**This table presents a frequency distribution of stiffness values observed in aluminum-alloy channels. Each stiffness value corresponds to the number of samples exhibiting that specific stiffness. The goal is to determine the mean stiffness of the sampled population, which can be approximated using statistical methods.

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Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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The data represents the body mass index (BMI) values for 20 females. Construct a frequency distribution beginning with a lower class limit of 15.0 and use a class width of 6.0. 17.7 33.5 26.7 25.6 25.4 28.2 23.4 18.3 28.7 22.7 19.2 21.9 25.6 37.7 32.4 29.7 44.9 30.9 29.5 25.3 Body Mass Index Frequency 15.0-20.9 nothing 21.0-26.9 nothing 27.0-32.9 nothing Body Mass Index Frequency 33.0-38.9 nothing 39.0-44.9 nothing
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110 adults with gum disease were asked the number of times per week they used to floss before their diagnoses. The (incomplete) results are shown below: # of times floss per week Frequency Relative Frequency Cumulative Frequency 14 0.1273 14 1 14 0.1273 28 2 10 0.0909 38 3 58 4 11 0.1 69 5 7 0.0636 76 6. 17 0.1545 7 17 0.1545 110 a. Complete the table (Use 4 decimal places when applicable) b. What is the cumulative relative frequency for flossing 7 times per week? Hint: Frequency Tables
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