78 65 The following data give the speeds (mph) as measured by radar of 10 cars traveling on a certain highway: 76 72 80 68 76 74 71 82 Assuming that the speeds of all cars traveling on this highway have a normal distribution. What is the point estimate of population mean? Construct a 90% confidence interval for the mean speed of all cars traveling on this highway? 3. Use hypothesis test to check the claim that the mean speed of cars is 75 mph.​

Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.

The higher the astm grain size number, the finer the gran is. a)-true b)-false