# hw7 - Business Mathematics I Homework 7 Prepared for Math...

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Business Mathematics I Homework 7 Prepared for Math 173 Pima Community College By Submitted on 8-6-07

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1. (one point) Consider the following random sample of X : 3, 7, 15, 8, 8, 9, 12, 13, 3, 7, 5, 11, 9, 10, 2, 7, 9, 6, 12, 8 Use the random sample to estimate ( 29 E X and ( 29 8 12 P X - . ) 12 8 ( X P 2 1 20 10 20 2 20 1 20 1 20 3 20 3 = = + + + + 2. (two points) Consider the Tuesday data only of the file Daily Sales Alt.xls . Let T be the continuous random variable that represents the gross sales amount on a Tuesday. ( i ) Find the value of ) 000 , 4 ( T F . ( ii ) Use the sample to estimate ( 29 \$4,000 \$6,000 P T - . ) 000 , 4 ( T F = 100 1 ( 29 \$4,000 \$6,000 P T - everything is below 6000 hence 1- ) 000 , 4 ( T F = 100 99 3 . ( two points) Based on the same data as in the previous problem, create a graph that displays an approximation of the p.d.f. , T f .
Bin Frequen cy 3500 0 3750 1 4000 1 4250 7 4500 31 4750 40 5000 43 5250 37 5500 25 5750 12 6000 3 More 0 p.d.f . of Tuesday Sales 0 5 10 15 20 25 30 35 40 45 50 3500 3750 4000 4250 4500 4750 5000 5250 5500 5750 6000 More Gr oss Sal es

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4. (two points) Using the data in Phone Log Alt.xls , create a graph that displays an approximation of the p.d.f. of C , the call arrival time.
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## hw7 - Business Mathematics I Homework 7 Prepared for Math...

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