A concrete mix is designed to withstand 3000 pounds per squa

A concrete mix is designed to withstand 3000 pounds per square inch (psi) of pressure. The following data represent the strength of nine randomly selected casts (inpsi)

3970, 4100, 3200, 3200, 2940, 3840, 4080, 4030, 3580

Compute the mean strength of the concrete. Select the correct choice below and, if necessary, fill in the answer.

(A) a.The mean strenght of the concrete is ___ psi of pressure                                                                      

      b. the mean does not exist

(B) a. the median strength of the concrete is ___ psi of pressure

      b. The median does not exist

(C) a. The mode of the strength of concrete is ___ psi of pressure

      b. The mode does not exist

Solution

The Minitab output is shown below.
Mean Median Mode
3660    3840 3200

A) The mean strenght of the concrete is 3660 psi of pressure.

B) The median strength of the concrete is 3840 psi of pressure.

C) The mode of the strength of concrete is 3200 psi of pressure.