What is the total surface area of this trapezoidal prism , 8, 4, 14 6, 4.47

The total surface area of this trapezoidal prism is 7.125

If you multiply it will be:
8 x 4=32                                                               
32 x 14=448                                                         
448 x 6=2,688                                                       
2,688 x 4.47=12,015.36

Due to the test statistic, there is sufficient evidence to support the claim that the doors are too short.

Step-by-step explanation:

The null hypothesis is:

The alternate hypotesis is:

Since the sample mean is less than the expected mean, we test the

Our test statistic is:

In which X is the sample mean, is the value tested at the null hypothesis, is the standard deviation and n is the size of the sample.

A lumber company is making doors that are 2058.0 millimeters tall.

This means that

A sample of 25 is made, and it is found that they have a mean of 2043.0 millimeters with a standard deviation of 6.0.

This means, respectively, that

Test statistic:

Looking at the z-table, z = -12.5 has a pvalue of 0 < 0.1, which means that there is sufficient evidence to support the claim that the doors are too short.