SOLUTION: in an industrial unit, certain machine producing washers, the probability of an item is 0.01. calculate the mean and standard deviation for tthe distribution of defective washers,

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Question 647632: in an industrial unit, certain machine producing washers, the probability of an item is 0.01. calculate the mean and standard deviation for tthe distribution of defective washers, when the total number is 500
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!

Mean:

mu+=+np

mu+=+%28500%29%2A%280.01%29

mu+=+5
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Standard Deviation

sigma+=+sqrt%28np%281-p%29%29

sigma+=+sqrt%28%28500%29%2A%280.01%29%2A%281-0.01%29%29

sigma+=+sqrt%28%28500%29%2A%280.01%29%2A%280.99%29%29

sigma+=+sqrt%285%2A%280.99%29%29

sigma+=+sqrt%284.95%29

sigma+=+2.2248595461287