Posted by **tms** on Sunday, May 19, 2013 at 3:10am.

in a grocery store, butter is sold in “sticks” that are shaped like little bricks. The weights of these sticks are like draws at random with replacement from a population with average 4 ounces and SD 0.2 ounces. The grocery store receives the butter in boxes; each box consists of 100 sticks.

1.The chance that the average weight of the sticks in one box is less than 3.999 ounces is closest to (pick the best of the available options, even if you can calculate the chance more accurately)

32%

36%

40%

44%

48%

50%

52%

2.The grocery store has received 6 boxes of butter. There is about ___________ chance that in at least one of the boxes, the average weight of sticks is less than 3.999 ounces. Fill in the blank with the best of the following options.

82%

86%

90%

94%

98%

- math -
**Andy**, Sunday, May 19, 2013 at 3:58am
Pls help

- math -
**john**, Sunday, May 19, 2013 at 8:50am
1.50%

2.82%

- math -
**Dean**, Sunday, May 19, 2013 at 8:57am
1)average=4; SD=0.2;sample =100

the expected total = 100*4=400

SE of total= sqrt(100)*0.2=2

(100*3.999-400)/2=-0.05

using applet:-5...0.05

approximately 48%

- math -
**Dean**, Sunday, May 19, 2013 at 9:00am
1)average=4; SD=0.2;sample =100

the expected total = 100*4=400

SE of total= sqrt(100)*0.2=2

(100*3.999-400)/2=-0.05

using applet:-5...-0.05

approximately 48%

- math -
**Dean**, Sunday, May 19, 2013 at 9:05am
2) binomial:

n=6 p=0.48; x=6

using applet:1.22306%

1-1.22306%=98%

- math -
**tms**, Monday, May 20, 2013 at 1:14am
its right dean thanks

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