Posted by BEARHUG on Sunday, February 15, 2009 at 1:59pm.
1) A Motor Company has purchased steel parts from a supplier for several years and has found that 10% of the parts must be returned because they are defective. An order of 25 parts is received. What are the mean and standard deviation of the defective parts?
A) Mean = 3.5; standard deviation = 2.5
B) Mean = 2.5; standard deviation = 1.5
C) Mean = 1.5; standard deviation = 2.5
D) Mean = 2.5; standard deviation = 3.5
2)Given a binomial random variable with n = 15 and = 0.4, find the following probability using the binomial table. P (6 < x < 10)
A) 0.0338
B) 0.1181
C) 0.0947
D) 0.3564

Statistics  Mathguru, Monday, February 16, 2009 at 9:41am
For 1).
Your values are the following:
p = .1, q = 1  p = .9, and n = 25
To find mean and standard deviation:
mean = np = (25)(.1) = ?
standard deviation = √npq = √(25)(.1)(.9)= ?
I'll let you finish the calculations to answer the question.
For 2).
Use the binomial table to determine your answer for the values given.
I hope this will help get you started.
Answer This Question
Related Questions
 statistics help please :(  A shipment of 50 parts contains 11 defective parts. ...
 Statistics/Binomal  I really need help I do not understand how to start this ...
 Statistics  In a shipment of 21 parts, four of the parts are defective. If ...
 statistics  A shipment of 50 parts contains 12 defective parts. Suppose 3 parts...
 math  im a girl ok um Three out of 200 machine parts were found to be defective...
 math  Three out of 200 machine parts were found to be defective. About how many...
 math  Three out of 200 machine parts were found to be defective. About how ...
 Math  Three out of 200 machine parts were found to be defective. About how many...
 Math  Three out of 200 machine parts were found to be defective. About how many...
 stats  Suppose a shipment of 500 machine parts contains 62 defective and 438 ...
More Related Questions