SOLUTION: A manufacturer of window frames knows from past experience that 10 per cent of the production will have some type of minor defect that will require adjustment. Suppose 30 windows

Question 1056956: A manufacturer of window frames knows from past experience that 10 per cent of the production will
have some type of minor defect that will require adjustment. Suppose 30 windows are selected at
random:
a. How many window frames would you expect to have minor defects?
b. What is the probability that more than 3 window frames will need minor adjustments?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
Expected value is 0.10*30=3 window frames x*(p(x))
probability of 0 is 0.90^30=0.0424
probability of 1 is 30*0.9^29*0.10=0.1413
probability of 2 is 435*0.9^28*0.10^2=0.2277
probability of 3 is 4060*0.9^27*0.1^3=0.2361
They add to 0.6051
More than 3 is 1-0.6051=0.3949, using the complement rule.
RELATED QUESTIONS
A manufacturer of window frames knows from past experience that 20 per cent of the... (answered by stanbon)

11. A manufacturer of window frames knows from past experience that 8 per cent of the... (answered by Boreal)

Help me please.... A manufacturer of window frames knows from long experience that 5... (answered by stanbon)

A manufacturer of window frames knows from long experience that 5 percent of the... (answered by edjones)

A manufacturer of window frames knows from long experience that 5 percent of the... (answered by stanbon)

A manufacturer of window frames knows from long experience that 20% of the production... (answered by ewatrrr)

Suppose a computer chip manufacturer knows from experience that in an average production... (answered by ewatrrr)

A company that manufactures bicycle frames has determined that the monthly profit (in... (answered by stanbon)