# Question

A company that manufactures large LCD screens knows that not all pixels on their screen light, even if they spend great care when making them. In a sheet 6 ft by 10 ft (72 in. by 120 in.) that will be cut into smaller screens, they find an average of 4.7 blank pixels. They believe that the occurrences of blank pixels are independent. Their warranty policy states that they will replace any screen sold that shows more than 2 blank pixels.

a) What is the mean number of blank pixels per square foot?

b) What is the standard deviation of blank pixels per square foot?

c) What is the probability that a 2 ft by 3 ft screen will have at least one defect?

d) What is the probability that a 2 ft by 3 ft screen will be replaced because it has too many defects?

a) What is the mean number of blank pixels per square foot?

b) What is the standard deviation of blank pixels per square foot?

c) What is the probability that a 2 ft by 3 ft screen will have at least one defect?

d) What is the probability that a 2 ft by 3 ft screen will be replaced because it has too many defects?

## Answer to relevant Questions

An insurance company needs to assess the risks associated with providing hurricane insurance. During the 22 years from 1990 through 2011, Florida was hit by 27 major hurricanes (level 3 and above). If hurricanes are ...In an effort to check the quality of their cell phones, a manufacturing manager decides to take a random sample of 10 cell phones from yesterday’s production run, which produced cell phones with serial numbers ranging ...An orthodontist has three financing packages, and each has a different service charge. He estimates that 30% of patients use the first plan, which has a $10 finance charge; 50% use the second plan, which has a $2 0 finance ...The daily exchange rates for the five-year period 2008 to 2013 between the euro (EUR) and the British pound (GBP) can be modeled by a Normal distribution with mean 1.19 euros (to pounds) and standard deviation 0.043 euros. ...Consider the IQ model N(100, 16) one last time. a) What IQ represents the 15th percentile? b) What IQ represents the 98th percentile? c) What’s the IQR of the IQs?Post your question

0