Concrete placed on a structure was subsequently cored after 28 days and the following results were obtained of the compressive strengths from five test specimens: 3625, 3750, 3825, 3450 and 4155 psi. Part 1) Determine the 90% two-sided confidence intervals of the mean concrete strength. (Answer correct to 1 decimal places) Lower Limit 3568.2 100% Upper Limit 3953.8 100% Part 2) Suppose the confidence interval established is too wide, and the engineer would like to have a confidence interval +310 psi of the computed sample mean concrete strength. What is the confidence level associated with the specified interval based the five measurements given above?

answer: median

step-by-step explanation:

the median is the middle value when a data set is ordered from least to greatest

so firstly, we need to isolate the y variables to be able to solve these inequalities. firstly, add 0.5x on both sides of the first inequality and subtract 1.5x on both sides of the second inequality:

now since the slope is positive for the first inequality, this means that the line going upwards belongs to the first inequality, and the line going downwards belongs to the second inequality.

next, since y ≥ in the first inequality, this means that the shaded region will be above the first inequality's line, thus shading regions a and b.

next, since y ≤ in the second inequality, this means that the shaded region is going to be below this line, thus shading regions a and c.

since both lines shade region a, this means that region a is the solution.

step-by-step explanation:

mark brainliest!

after 1 year: 221 deer

step-by-step explanation:

30% of 170 is 51. 170+51=221

i saw this question before, dont know the asnwer srry

step-by-step explanation: