Project #9271 - Statistics

8.  At an aggregate plant (crushed rock) each loaded truck is weighed upon leaving as part of the quality control process.  On average, a loaded truck should weigh 28 tons with a standard deviation of 1.5 tons.  The distribution is approximately mound shaped and symmetrical.  Using the data below, make a control chart for the truck weights during a randomly chosen day.  Indicate any out of control warnings that you observe.

 Truck 1 2 3 4 5 6 7 8 9 10 11 Weight 24 25 31 30 28 28 24 25 24 30 29

The control chart I did is attached (scan 1).

The second part of the question is:

9.  Using the information form #8convert weights of 29 tons and 26 tons to z-scores and sketch the graph of the weight distribution on a bell curve with weights of 29 tone and 26 tons indicated on the graph.  This is also attaches (scan 2).

The part I’m having trouble with is:

12.  Using the information about mean weights of loaded trucks in problems 8 and 9 answer the following question:

a) What is the probability that a single truck chosen at random will weigh more than 29 tons?

b)  What is the probability that 8 trucks chosen at random will have an average weight of more than 29 tons?

 Subject Mathematics Due By (Pacific Time) 07/17/2013 01:30 pm
TutorRating
pallavi

Chat Now!

out of 1971 reviews
amosmm

Chat Now!

out of 766 reviews
PhyzKyd

Chat Now!

out of 1164 reviews
rajdeep77

Chat Now!

out of 721 reviews
sctys

Chat Now!

out of 1600 reviews

Chat Now!

out of 770 reviews
topnotcher

Chat Now!

out of 766 reviews
XXXIAO

Chat Now!

out of 680 reviews