Suppose the Life of a Particular Brand of Calculator Battery

question 40

Multiple Choice

Suppose the life of a particular brand of calculator battery is approximately normally distributed with a mean of 75 hours and a standard deviation of 10 hours. What is the probability that 16 randomly sampled batteries from the population will have a sample mean life of between 70 and 80 hours?

• A) 0.9444
• B) 0.5121
• C) 0.7124
• D) 0.1512

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