Pvc pipe is manufactured with mean diameter of 1.01 inch and a standard deviation of 0.003 inch. find the probability that a random sample of n = 9 sections of pipe will have a sample mean diameter greater than 1.009 inch and less than 1.012 inch.

0.8186

Step-by-step explanation:

Given: Mean :

Standard deviation :  

Sample size :  

The formula to calculate z-score :-

For x=1.009 inch

For x=1.012 inch

Now, The p-value =

Hence, the required probability = 0.8186

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you