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Midterm

Econ 221 Midterm1ANS.doc

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Department
Economics
Course
ECON 221
Professor
All Professors
Semester
Fall

Description
Concordia UniversityDepartment of EconomicsECON 2214Section CCMidterm 1 Examination AnswersDate February 13 2014Professor N Islam1Thirty AA batteries were tested to determine how long they would last The results to the nearest minute were recorded as follows423 369 387 411 393 394 371 377 389 409392 408 431 401 363391 405 382 400 381399 415 428 422 396 372 410 419 386 390a Note that the lowest value is 363 and the highest is 431 Construct a frequency distribution involving 8 class intervals starting with 360369 range of battery life in minutes Call the midvalue ofthe ith class as X and itsfrequency as f i128Comment on the shape of the histogram symmetric or asymmetriciib Find the relative frequency of each class P f n n30 and the probability distribution of X Compare i ithe histogram and the probability distributionbAnsaBatterylifeminutesxFrequencyfRelativefrequencyPercentfrequency36036920077370379301010380389501717390399702323400409501717410419401313
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