1A. Cоmputer keybоаrd fаilures аre due tо 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 improper connection. Write down what formula are you using. Please use 4 digits after the decimal. (3 points) 1B. A hospital employs 220 nurses, 180 of whom are registered nurses (RNs) and the rest are licensed practical nurses (LPNs). If 9 nurses are selected for a committee:(i) Find the probability that 6 are RNs and the others are LPNs.(ii) Find the probability that all are RNs. Write what distribution are you using and the formula. (4 points)
1A. Cоmputer keybоаrd fаilures аre due tо 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 loose keys. Write down what formula are you using. Please use 4 digits after the decimal (3 points) 1B. Among 500 passengers on a cruise ship, 350 purchased travel insurance and the rest did not. If 12 passengers are randomly selected for a survey:(i) Find the probability that 8 of them have purchased insurance and the others have not.(ii) Find the probability that none of them purchased insurance. Write what distribution are you using and the formula. (4 points)