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The time required to assemble an electronic component is normally distributed with a mean and a...

The time required to assemble an electronic component is normally distributed with a mean and a standard deviation of 24 minutes and 13 minutes, respectively. [You may find it useful to reference the z table.]


a. Find the probability that a randomly picked assembly takes between 19 and 27 minutes. (Round "z" value to 2 decimal places and final answer to 4 decimal places.)



b. It is unusual for the assembly time to be above 43 minutes or below 9 minutes. What proportion of assembly times fall in these unusual categories? (Round "z" value to 2 decimal places and final answer to 4 decimal places.)

Math   Statistics-And-Probability   
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