Friday, July 31, 2009

Math question?

A company produses pushpins in the percents shown in the table.The school secretary opens a large bag of pushpins.She putsthe pins into small boxes to distribute to teachers.She puts 50 pins in each box.





color percent


white 15%


yellow 10%


red 15%


orange 20%


green 15%


blue 25%





A. how many pushpins of each color do u expect to be in each box?





B. how do u expect the number of pushpins of each color to vary across the samples?





C. u can simulate filling the boxes by generating random integers from 1 to 20.Which numbers would u let represent each color?How many random numbers do u need to generate to simulate filling one box?





D. Carry out the similation describe in part (c) 3 times.Compare the distributions of colors in your similated samples with the expected distribution from part (A).





E. s\Suppose the Secretary selects a random sample of 1,000 pushpins from the bag.How closely would u expect the percent in the table?

Math question?
Change % = numbers


A. white .15 *50 =7.5


yellow .10*50 =5


red .15*50= 7.5


orange .20*50=10


green .15*50=7.5


blue .25 *50=12.5





I don't think you measure pins in half but...
Reply:A, multiply each percent by 1/2 (IE orange = 20% *0.5 = 10 pins)





B, depends on how the manufacturer labels them and how "large" the secretary's large bag is .. shoudl be very little variation.





C,


1-5 = Blue


6-8 = green


9-12 = orange


13 - 15 = red


16 %26amp; 17 = yellow


18-20 = white


... you need to generate 50 random numbers





D, ... YOU need to do this, this is your math homework and you have an "approved" method of generating random numbers from your teacher.





E, same as answer B


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