statistics
posted by john .
Can someone provide me with some assistance in answering this question..
A company manufacturers batteries in BATCHES of 18 and there is a 3% rate of defect. Find the standard deviation for the number of defects per batch.
The probability of a defect is p = 0.03
The mean number of defects in a batch of N = 18 is m = p N = 0.03 x 18 = 0.54
The standard deviation of the number of defects in a batch of 18 is
sigma = sqrt [N p (1p)] = 0.72, which actually exceeds the mean value in this case.

Can you explain how you got the standard deviation of the number of defects in a batch of 18 is sigma=sqrt[N p (1p)]=0.72. IN OTHER WORDS HOW DID YOU GET 0.72
Respond to this Question
Similar Questions

statistics
A company manufacturers batteries of 18 and there is a 3% rate of defects. Find the standard deviation for the number of defects per batch. Did you mean to write: "A company manufacturers batteries IN BATCHES of 18 and there is a 3% … 
Statistics
A company manufactures calculators in batches of 64 and there is a 4% rate of defects. Find the probability of getting exactly three defects in a batch. 
statistics
a company manufactures calculators in batches of 45 and claims that the rate of defects is 4%.find the probability of getting exactly 2 defects in a batch of of 45 if the rate of defects is 4%.if the store receives a batch of 45 calculators … 
statistics
A company manufactures caclculators in batchers of 64 and there is a 5% rate of defects. Find the probability of getting exactly three defects in a batch 
statistics
A company manufactures caclculators in batchers of 64 and there is a 5% rate of defects. Find the probability of getting exactly three defects in a batch 
statistics
A company manufactures calculators in batches of 64 and there is a 5% rate of defects. What is the standard deviation for the number of defects per batch? 
statistics
A company manufactures calculators in batches of 64 and there is a 5% rate of defects. What is the standard deviation for the number of defects per batch? 
math
A company manufactures calulatoirs in batches of 64 and ther is a 5% rate of defects. Find the standard deviation for the number of defects per batch 
statistics
a company manufactures batteries in batches of 18 and there is a 3% defect rate. Find the standard deviation for a number of defects per batch? 
Statistics
A company manufactures calculators in batches of 64, and there is a 5% defect rate. Find probability of getting at least three defects