Refer to exercise 12. let z = x + y represent the total number of repairs needed. a. find μz . b. find σz . c. find p(z = 2). statistics for engineers

Assuming the question I linked is the same as yours, you should have the following information (provided you completed exercise 12):








Given that , we have





Finally, is the same as the event that any one of the following occurs: and ; and ; or and . So we have

Option A is true

Step-by-step explanation:

Given: ∠1 ≅ ∠9

To Find : Which lines must be parallel?

Solution :

∠1 and ∠9 are corresponding angles

When the traversal cut the the two lines and forms the angles and if these angles are equal so, these two lines must be parallel

So, r is parallel to s

Hence Option A is true .