Julia

A survey of needy and disabled youths showed that 53% of those who had no preschool education were arrested or charged with a crime by the time they were 19, whereas only 28% who had preschool education wound up in this category. The survey did not specify what percentage of the youths in the survey had preschool education, so let us take a guess at that and estimate that 25% of them had attended preschool. (Round all answers to the nearest 1%.) 

(a) What percentage of the youths arrested or charged with a crime had no preschool education?(b) What would this figure be if 75% of the youths had attended preschool?

During a year ending April 30 of that year, there were approximately 5.0 million sales of existing homes in the United States, of which 1.9 million were sold in the West. During April of that year there were a total of 410,000 existing homes sold in the United States, of which 120,000 were sold in the West. (Round your answers to two decimal places.)

(a)Find the probability that a home sale in the year ending April 30 of that year, took place in the West, given that the home was sold during April of that year.(b)Find the probability that a home sale in the year ending April 30 of that year, took place in April of that year, given that it took place in the West.

A poker hand consists of 5 cards from a standard deck of 52. Find the number of different poker hands of the specified type.

two pairs with exactly one pair being eights (two eights, two of another denomination, and one of a third)

The vast majority of Visa and Discover Card credit cards have 16-digit card numbers. The first digit is either 4 (Visa) or 6 (Discover), digits 2 through 6 identify the issuer, digits 7 through 15 identify the customer, and the last digit is a "check digit" determined by the digits that precede it. Your company, CreditXplosion, Inc., issues both Visa and Discover credit cards.

a)

How many different CreditXplosion cards are possible?

b)How many different CreditXplosion Discover card numbers are possible in which the check digit is wrong?

The hint we got for one of them was "a property of matter and its attraction to other matter" The second letter is r and the last letter is y . I cant seem to figure this one out .