(Ch7) If the mean time between in-flight aircraft engine shutdowns is 12,500 operating hours, what is the 90 percentile on the distribution of the number of hours until the next shutdown? (hint: convert the mean time between events to the mean events per hour λ, then apply inverse exponential) Question 7Select one: a. 20,180 hours   b. 18,724 hours c. 23,733 hours d. 28,782 hours

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Attempts 3. A decision at the margin Yvette is a hard working fourth-year university student. One Tuesday, she decides to work nonstop until she has answered 200 practice problems for her math course. She starts work at 8:00 AM and uses a table to keep track of her progress throughout the day. She notices that as she gets tired, it takes her longer to solve each problem. Time 8:00 AM 9:00 AM Average/3 10:00 AM 11:00 AM Noon Total Problems Answered 0 BO 140 100 200 Use the table to answer the following questions Alt+A The marginal, or additional, gain from Yvette's second hour of work, from 9:00 AM to 10:00 AM, is problems.

Compute to three decimal places. (See attached) Initial values are:      PX = $9500     PY = $10000   I = $15000      A = $170000   W = 160 This function is:        Qs = 89830 -40PS +20PX +15PY +2I +.001A +10W

i Xi CT CONTI 1 2 -0.75 1.30 -1.55 1.25 As a reminder: When calculating answers, please use at least 4 decimals for intermediate calculations. 13579 3 5 4 7 5 Yi -2.50 9

Each term (3 months) the current group of economics students completed a questionnaire as to how much they would spend on new purchases compared to how much they would save/pay off bills, if they suddenly and unexpectedly received a check for $1,000. The average MPC is shown in the table below. Month in which student poll was taken Average of students’ responses as MPC March 0.41 June 0.30 September 0.22 December 0.56   What do these MPC’s imply about the students’ thinking over the course of the year?   (Enter response here.)   What is likely happening in the economy during the same period of time?

Define the term, the variation of PW?