Operations Manager in an automobile assembly plant wants to reduce the time a process takes to assemble a part. Study team collects data and determines that the assembly times are normally distributed with a mean of 75 seconds and standard deviation of 6 seconds.

1.What proportion of assembly times are between 70 and 80 seconds? Keep four decimal places.

2.What assembly time is the upper limit of the 99% fastest times? Keep four decimal places.