Mena is at the gym. a) She will use each of these pieces of equipment once. Stepper (S) Treadmill (T) Bike (B) Rower (R) Mena will use the stepper first. List all the possible orders in which she could use the four pieces of equipment. The first order has been done for you, please list the rest in the same way. STBR, (2) b) The table shows how long Mena spends on each piece of equipment. Stepper 11 minutes Mena starts on the stepper at 1.55 pm She has a break of 3 minutes between Treadmill 15 minutes pieces of equipment. Bike 48 minutes What time does she finish on her last piece Rower 1 hour 25 minutes of equipment? (3)

Atechnician compares repair costs for two types of microwave ovens (type i and type ii). he believes that the repair cost for type i ovens is greater than the repair cost for type ii ovens. a sample of 6767 type i ovens has a mean repair cost of $79.79$⁢79.79. the population standard deviation for the repair of type i ovens is known to be $19.18$⁢19.18. a sample of 5555 type ii ovens has a mean repair cost of $75.24$⁢75.24. the population standard deviation for the repair of type ii ovens is known to be $21.40$⁢21.40. conduct a hypothesis test of the technician's claim at the 0.050.05 level of significance. let μ1μ1 be the true mean repair cost for type i ovens and μ2μ2 be the true mean repair cost for type ii ovens. step 2 of 4 : compute the value of the test statistic. round your answer to two decimal places.