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Assuming a particular carbon fiber strand has a mean breaking strength of 1500 psi, a standard...

Assuming a particular carbon fiber strand has a mean breaking strength of 1500 psi, a standard deviation of 125 psi, and the breaking strength is approximately normally distributed, answer the following question: If the company who produces this carbon fiber strand wants to guarantee that 99.9% of their strands will withstand a specific pressure, what would that pressure be?

A. 1500

B. 1113.7

C. 1209.2

D. 1886.3

Math   Statistics-And-Probability   
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