A Carload of Steel Rods Has Arrived at Cybermatic Construction

question 39

Multiple Choice

A carload of steel rods has arrived at Cybermatic Construction Company.The car contains 50,000 rods.Claude Ong,manager of Quality Assurance,directs his crew measure the lengths of 100 randomly selected rods.If the population of rods has a mean length of 120 centimetres and a standard deviation of 0.05 centimetres,the probability that Claude's sample has a mean between 119.985 and 120.0125 centimetres is ___.

• A)0.9925
• B)0.9974
• C)0.9876
• D)0.9544
• E)0.9044