# Question: According to United Mileage Plus Visa November 22 2004 41

According to United Mileage Plus Visa (November 22, 2004), 41% of passengers say they “put on the earphones” to avoid being bothered by their seatmates during flights. To show how important, or not important, the earphones are to people, consider the variable x to be the number of people in a sample of 12 who say they “put on the earphones” to avoid their seatmates. Assume the 41% is true for the whole population of airline travelers and that a random sample is selected.

a. Is x a binomial random variable? Justify your answer.

b. Find the probability that x _ 4 or 5.

c. Find the mean and standard deviation of x.

d. Draw a histogram of the distribution of x: label it completely, highlight the area representing x _ 4 and x _ 5 draw a vertical line at the value of the mean, and mark the location of x that is 1 standard deviation larger than the mean.

a. Is x a binomial random variable? Justify your answer.

b. Find the probability that x _ 4 or 5.

c. Find the mean and standard deviation of x.

d. Draw a histogram of the distribution of x: label it completely, highlight the area representing x _ 4 and x _ 5 draw a vertical line at the value of the mean, and mark the location of x that is 1 standard deviation larger than the mean.

## Relevant Questions

According to the USA Today Snapshot “Knowing drug addicts,” 45% of Americans know somebody who became addicted to a drug other than alcohol. Assuming this to be true, what is the probability of the following? a. Exactly ...Where does all that Halloween candy go? The October 2004 issue of Readers’ Digest quoted that “90% of parents admit taking Halloween candy from their children’s trick-or-treat bags.” The source of information was the ...A binomial random variable x is based on 15 trials with the probability of success equal to 0.2. Find the probability that this variable will take on a value more than 2 standard deviations from the mean. According to a September 2008 poll and report done by Pew/Internet, 62% of employed adults use the Internet or e-mail on their jobs. What is the probability that more than 180 out of 250 employed adults use the Internet or ...The middle 60% of a normally distributed population lies between what two standard scores?Post your question