Breaking Strength of Steel Cable The average breaking strength of a certain brand of steel cable is , with a standard deviation of . A sample of cables is selected and tested. Find the sample mean that will cut off the upper of all samples of size taken from the population. Assume the variable is normally distributed. Round intermediate -value calculations to decimal places and round the final answer to at least decimal places.

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.