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e Scare https www.mathai.com Student playerHomeworkasxhomeworkidlassensoquestonia - ziarushed stab 22322674 le Homework: Chapter 3 Homework Save Score: 0.6 of 1 pt 23of30(30 complete) HW Score: 67.44%, 2023 of 30 pts 3.4.31 Question Help * A cellular phone company monitors monthly phone usage. The following data represent the monthly phone use in minutes of one particular custormer for the past 20 months. Use the given data to answer parts (a) and (b). 337 533 459 388 553 433 424 349 422 528 462 382 394 437 396 322 499 475 397 336 (a) Determine the standard deviation and interquartile range of the data s-(Round to two decimal places as .needed ) a word espective Google w Enter your answer in the answer box and then dick Check Answer inths ago ago ths ago 3 Pemsining Clear A Check A Create a new document and edt with others at the same time - from your computer phone or tablet People also search for e here to searchExplanation / Answer
Solution:
n = Number of Data Values = 20
Sum of Data Values = x = 8621
Sample Mean = x = x / n = 8621 / 20 = 431.05
Sum of deviation squared = (xi - x)2 = 118872.95
s2 = Sample Variance = (xi - x)2/(n - 1) = 118872.95/19 = 6256.471052631577
s = Sample Standard Deviation = Sample Variance = 6256.471052631577 = 79.0978 ~ 79.10
Q1 = First Quartile = Middle of First Half of Data Set = 380
Q3 = Third Quartile = Middle of Second Half of Data Set = 468.5
IQR = Interquartile Range = Q3 - Q1 = (468.5) - (380) = 88.5
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