Answer:
Mean of sampling distribution = 25 inches
Standard deviation of sampling distribution = 4 inches
Step-by-step explanation:
We are given the following information in the question:
Mean, μ = 25 inches
Standard Deviation, σ = 12 inches
Sample size, n = 9
We are given that the distribution of length of the widgets is a bell shaped distribution that is a normal distribution.
a) Mean of the sampling distribution
The best approximator for the mean of the sampling distribution is the population mean itself.
Thus, we can write:

b) Standard deviation of the sampling distribution

Answer:
A
Step-by-step explanation:
Answer:
The answer is 'C' "The slope of line BC is equal to the slope of line segment DE"
Step-by-step explanation:
This is correct. I checked my answer for this about 3 times. If this isn't correct then my next bet is answer 'D'
{-Please give me credit for trying, Thank you-}