Answer:

Step-by-step explanation:
The image below shows step-by-step on how to solve it.
<em>Hope this helps! </em>:)
Answer:
15.
Step-by-step explanation:
The new average will be 11 + 4 = 15.
Answer:

Step-by-step explanation:
Average length 
Standard deviation 
Sample size 
Generally The point estimate for the mean length of all bolts in inventory is


Hope it helps you........