How to Calculate Standard Deviation for Defective Bolts?

[moonman239]

1. The problem statement,
The probability of a defective bolt is 1/10. Find the standard deviation of defective bolts of a normally distributed set of 400 bolts.
and given/known data
Mean = 40 bolts
2. The attempt at a solution
None

 

[Mark44]

1. The problem statement,
The probability of a defective bolt is 1/10. Find the standard deviation of defective bolts of a normally distributed set of 400 bolts.
and given/known data
Mean = 40 bolts
2. The attempt at a solution
None

Per the forum rules, you must make an attempt at a solution.

 

[moonman239]

Per the forum rules, you must make an attempt at a solution.

I can't even think of one, but I'll post one as soon as I can.

 

[moonman239]

Oooohhhh, wrong title. Argh.