An article in the Journal of Engineering Tribology discusses several experiments involving various lubricants. In one experiment, 45 steel balls lubricated with purified paraffin were subjected to a 40 kg load at 600 rpm for 60 minutes. The average wear, measured by the reduction in diameter, was 673.2 , and the standard deviation was 14.9. Assume that the specification for the lubricant is that the mean wear must be less than 675. Required:
Find the P-value.

the P value is 45.22%

Step-by-step explanation:

The computation of the P value is as follows;

Given that

standard deviation = 14.9

mean = 675

Reduction in diameter= 673.2

Based on the above information,

We have to applied the following formula i.e.

Now the P value for -0.1208 is 0.4522 i.e. 45.22%

Hence, the P value is 45.22%

The same is to be considered

a is the right answer

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.