An automobile manufacturer randomly chose 10 vehicles for which to monitor the number of service calls in one year. There was a total number of 22 service calls. (a) Estimate the MTBF. (b) Calculate...

An automobile manufacturer randomly chose 10 vehicles for which to monitor the number of service calls in one year. There was a total number of 22 service calls.

(a) Estimate the MTBF.

(b) Calculate the MTBF 90% confidence interval.

(c) List issues that need clarification for a better assessment of ways to reduce the frequency of defects.