Given Σ(x-μ)² = 78 and N= 80, then the standard deviation, a, is approximatelya) 0.994acerb) 0.110c) 0.975d) 0.987

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Answered: Given Σ(x-μ)² = 78 and N= 80, then the…

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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A population has a mean of 1398.25 and standard deviation of 246.85 12 What fraction of the means from random samples of size 82 are within ± 40 from the population mean? a 0.8577 b 0.8327 c 0.8085 d 0.7849
8. Given E(x,-)-78 and N= 80, then the population standard deviation, a, is approximately O a) 0.975 O b) 0.987 O0.994 Od) 0.110 SAMSUNG
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Find the standard deviation, s, of sample data summarized in the frequency distribution table below by using the formula below, where x represents the class midpoint, f represents the class frequency, and n represents the total number of sample values. Also, compare the computed standard deviation to the standard deviation obtained from the original list of data values, 11.1. n[Σ(f•x?)] - [Σ(-x)]2 n(n −1) Interval 58-64 65-71 72-78 30-36 1 37-43 4 44-50 4 51-57 2 Frequency 31 39 CO Standard deviation = (Round to one decimal place as needed.)

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Given Σ(x-μ)² = 78 and N= 80, then the standard deviation, a, is approximately a) 0.994 Ob) 0.110 c) 0.975 d) 0.987