A nurse is tasked with evaluating the battery lifetimes for the new battery powered ventilators.The manufacturer claims the batteries have a mean life of 48 months and a variance of 25 months.The nurse tests 30 batteries.If the manufacturer is correct, what is the probability that her sample has a mean battery lifetime of less than 46 months?

Question 80 options:

0.0143

0.9817

0.9857

0.0286

0.0019