The survey by the National Center for Health Statistics further found that 49% of adults ages 25–29 had only a cell phone and no landline. We randomly select four 25–29-year-olds: a) What is the probability that all of these adults have a only a cell phone and no landline? b) What is the probability that none of these adults have only a cell phone and no landline? c) What is the probability that at least one of these adults has only a cell phone and no landline?

Eleven percent of American children (ages 4 to 17) have Attention Deficient Hyperactivity Disorder (ADHD) according to the Center for Disease Control. Suppose six American children in this age group are randomly selected, is the probability that at least one has ADHD unusual? Eleven percent of American children (ages 4 to 17) have Attention Deficient Hyperactivity Disorder (ADHD) according to the Center for Disease Control. Suppose six American children in this age group are randomly selected, is the probability that at least one has ADHD unusual?  No, this probability is not unusual because it is more than 0.05.  Yes, this probability is unusual because it is more than 0.05.  No, this probability is not unusual because it is within 2 standard deviations of the mean.  Yes, this probability is unusual because it is not within 2 standard deviations of the mean.  No, this probability is not unusual because it is more than 0.01.

a. One out of four mini-vans sold by a nationwide auto dealer has a hidden defect in its transmission. i. What is the probability that a randomly selected purchaser of two mini-vans will wind up with at least one mini-van with a defective transmission? ii. What is the probability that a randomly selected purchaser of two mini-vans will wind up with exactly one mini-van with a defective transmission?

In a survey of 1200 college students living in the dorms, 600 said that they had only a tablet in their rooms, 400 said that they had only laptop in their rooms, and 150 said that they had both a tablet and a laptop in their rooms. The remaining 50 students had neither. If a student is randomly chosen from this group, the probability that the student does have a laptop given that the student has a tablet is

In 2014, the percentage of the U.S. population that speak English only in the home is 78.9%. Choose 15 U.S. people at random. What is the probability that exactly one-third of them speak English only? At least one-third? What is the probability that at least 9 do not speak English in the home?