cheese2010
New member
- Joined
- Mar 21, 2011
- Messages
- 2
Suppose that a random sample of rocks is taken to assure that the importer is fulfilling his contract requirements. You select a sample of size 20 from a population with (an unknown) mean ? and standard deviation ?.
(a) If the mean of all the measurements is 150 lb. and the standard deviation of these is 10 lb., what are the estimates of the true mean and the true standard deviation of the population from which the samples were drawn.
(b) What is the standard deviation of this estimate if we were to repeat the sampling many times
(c) 7 sacks of rocks will be formed and lifted onto carts. What is the probability that the weight of the seven sacks on an individual cart will be greater than 1400 lb. (the cart’s capacity)?
(a) If the mean of all the measurements is 150 lb. and the standard deviation of these is 10 lb., what are the estimates of the true mean and the true standard deviation of the population from which the samples were drawn.
(b) What is the standard deviation of this estimate if we were to repeat the sampling many times
(c) 7 sacks of rocks will be formed and lifted onto carts. What is the probability that the weight of the seven sacks on an individual cart will be greater than 1400 lb. (the cart’s capacity)?