The length of life of an instrument produced by a machine has a normal distribution with a mean of 9.4 months and a standard deviation of 3.2 months. What is the approximate probability that an instrument produced by this machine will last between 6 and 11.6 months? (up to 2 decimal places) a. None of the others b. 0.54 c. 0.40 d. 0.16 e. 0.32
Added by David C.
Step 1
First, we need to standardize the given values using the z-score formula: $z = \frac{x - \mu}{\sigma}$, where $x$ is the value, $\mu$ is the mean, and $\sigma$ is the standard deviation. Show more…
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