a process produces strings

A process produces strings of Christmas tree lights that historically have experienced a defective rate of 4%. A customer has placed an order for 140 strings of lights. Use the normal approximation to the binomial distribution to answer parts a through e. a. Calculate the mean and standard deviation for this distribution. The mean is 5.6 . (Round to four decimal places as needed.) The standard deviation is 2.3186 . (Round to four decimal places as needed.) b. What is the probability that fewer than 3 strings in this order will be defective? The probability is (Round to four decimal places as needed.)