4 A certain type of thread is manufactured with a mean tensile strength of 78.3kg and standard deviation of 5.6kg. Assuming that the strength of this type of thread is distributed approximately normal, find a) the probability that the mean strength of a random sample of 10 such thread falls between 77kg and 79kg b) the value of x to the right of which 15% of the means computed from random samples of size 10 would fall. Question 5 It is known that a particular machine produces 10% defective electrical components. A box of 100 items of these electrical components will be rejected by a buyer if more than 11% of the items are defective. Buyer A ordered 200 boxes of these electrical components. How many of these boxes will be rejected by buyer A