9) A construction company employs 2 sales engineers. Engineer 1 does the work in estimating cost for 70% of jobs bid by the company. Engineer 2 does the work for 30% of jobs bid by the company. It is known that the error rate for Engineer 1 is such that 0.02 is the probability of an error when he does the work, whereas the probability of an error in the work of Engineer 2 is 0.04. What is the probability that a bid provided by the company will contain an error in the cost estimates?
If a serious error is known occurred, what is the probability that it was made by Engineer 2?

The probability that the error occurred when Engineer 2 made the mistake is 0.462 on the other hand the probability that the error occurred when the engineer 1 made the mistake is 0.538

Explanation:

Let denote the event that the 1st  engineer  does the work.so we write

=0.7

Let denote the event that the 2nd engineer  does the work .So we write

=0.3

Let O denote the event during which the error occurred .so we write

=0.02(GIVEN)

=0.04(GIVEN)

Now we need to find when did the error in the work occur so we will compare the probability of the work done by engineer 1 and engineer 2

lets find the Probability of the Engineer 1

Using Bayes theorem,we get

=0.02*0.7/0.02*0.7+0.04*0.3 = 0.014/0.026=0.538

lets find the Probability of the Engineer 2

=0.04*0.3/0.02*0.7+0.04*0.3=0.012/0.026=0.462

Since ,0.462<0.538 so it is more prominent that the Engineer 1 did the work when the error occurred

the correct answer is c.stops after infancy and childhood.

myelin is the substance of the central nervous system (cns) that insulates nerve cell axons to increase the speed at which nerve impulse travels. myelination is a process of myelin formation. this process occurs postnatally, begins in the embryo during the midst of early development and finishes after birth.

how is this a question? in order for me to answer it i have to understand the question

explanation: