Computer keyboard failures are due to faulty electrical conn…

Computer keyboard failures are due to faulty electrical connects (12%) or mechanical defects (88%). Mechanical defects are related to loose keys (27%) or improper assembly (73%). Electrical connect defects are caused by defective wires (35%), improper connections (13%), or poorly welded wires (52%). Find the probability that a failure is due to improperly connected or poorly welded wires.

The speed of a file transfer from a server on campus to a pe…

The speed of a file transfer from a server on campus to a personal computer at a student’s home on a weekday evening is normally distributed with a mean of 63 kilobits per second and a standard deviation of four kilobits per second. What is the probability that the file will transfer at a speed of 70 kilobits per second or more?