(Medal & Fan)
For a specific type of machine part being produced, the diameter is normally distributed, with a mean of 15.000 cm and a standard deviation of 0.030 cm. Machine parts with a diameter more than 2 standard deviations away from the mean are rejected.

If 15,000 machine parts are manufactured, how many of these will be rejected?
A) 560
B) 680
C) 750
D) 970

Question

(Medal & Fan)
For a specific type of machine part being produced, the diameter is normally distributed, with a mean of 15.000 cm and a standard deviation of 0.030 cm. Machine parts with a diameter more than 2 standard deviations away from the mean are rejected.

If 15,000 machine parts are manufactured, how many of these will be rejected?
A)	560	
B)	680	
C)	750	
D)	970

c1ndrella78 · Answer

go to this site http://davidmlane.com/hyperstat/z_table.html It will show you the fraction more than 2 std away, and you can multiply that by 15000 to get your answer.

c1ndrella78 · Answer

so theirs 2 steps, multiply .025 by 15000
Then multiply that answer by 2
and you'll have your answer