The lifetime of a certain transistor in a certain application has mean 900 hours and standard deviation 30 hours. Find the mean and standard deviation of the length of time that four transistors will last.

Answer

Step 1 of 3

Here they mean and standard deviation of one transistor

Now we need to find mean and standard deviation of four transistors

The mean of the transistor is =900

The standard deviation of the transistor is =30