Mathematics, 14.04.2020 17:20 margaretjloah12

0 Machine repair time. [Note: This exercise refers to an optional section in Chapter 5.] An article in Industrial Engineering (Aug. 1990) discussed the importance of modeling machine downtime correctly in simulation studies. As an illustration, the researcher considered a single-machine-tool system with repair times (in minutes) that can be modeled by an exponential distribution with u = 60. (See optional Section 5.6.) Of interest is the mean repair time x of a sample of 100 machine breakdowns. a. Find E1x2 and the variance of x. b. What probability distribution provides the best model of the sampling distribution of x ? Why? c. Calculate the probability that the mean repair time x is no longer than 30 minutes.

Answers: 2

Show answers

Another question on Mathematics

Mathematics, 20.06.2019 18:04

Here is their argument. given the obtuse angle x, we make a quadrilateral abcd with ∠dab = x, and ∠abc = 90◦, and ad = bc. say the perpendicular bisector to dc meets the perpendicular bisector to ab at p. then pa = pb and pc = pd. so the triangles pad and pbc have equal sides and are congruent. thus ∠pad = ∠pbc. but pab is isosceles, hence ∠pab = ∠pba. subtracting, gives x = ∠pad−∠pab = ∠pbc −∠pba = 90◦. this is a preposterous conclusion – just where is the mistake in the "proof" and why does the argument break down there?

Answers: 2

Answer

Mathematics, 21.06.2019 17:50

To solve the system of equations below, grace isolated the variable y in the first equation and then substituted into the second equation. what was the resulting equation? 3y=12x x^2/4+y^2/9=1

Answers: 1

Answer

Mathematics, 21.06.2019 18:30

Tod does not have any cookies. david gives jeff 8 cookies. then he splits half of the cookies he has left with tod. david let’s c represent the number of cookies that he starts with. he finds the number of cookies that tod has is 1/2 the difference of c and 8. write an expression to represent the number of cookies that tod has.

Answers: 2

Answer

Mathematics, 21.06.2019 22:30

Avery’s piggy bank has 300 nickels, 450 pennies, and 150 dimes. she randomly picks three coins. each time she picks a coin, she makes a note of it and puts it back into the piggy bank before picking the next coin.

Answers: 1

Answer

You know the right answer?

0 Machine repair time. [Note: This exercise refers to an optional section in Chapter 5.] An article...

Questions