the director of vehicle maintenance for a large mass transportation authority wants to know the average life of bus tires for the fleet of 1,800 busses. A random sample of 100 tires is studied and the mean life is 20,000 miles, with a standard deviation of 1,200 miles. Construct and interpret a 95percent confidence interval for the true life of tires.

step-by-step explanation:

i think you should think about the question and not look online.

x=30

step-by-step explanation:

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m

need more detail

step-by-step explanation:

lele