In a large population, very close to 25% of the observations will fall below the 25th percentile (Q1), and close to 75% fall below the 75th percentile (Q3). The

Web site of the Educational Testing Service reports that on the SAT

Mathematics test, with a possible perfect score of 800, the 96th percentile of

1,475,623 scores nationwide is a score of 720.

What is the best estimate of exactly how many scores were below 720?

A. 84

ооо

B. 1,417,000

C. 557

D. 80%

оо

E. 192,000

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Suppose there are 10 five and six-year-old attending a birthday party. when a 30 year old mother walks into the room with an infant in her arms, what happens to the mean age in the room? what happens to the standard deviation of ages in the room? a. the mean and standard deviation of both change. b. the meaning will change, but the standard deviation will stay approximately the same. c. i mean will stay approximately the same, but the standard deviation will change. d. the mean and standard deviation will both stay approximately the same.

Aschool puts on a play. the play costs $1,200 in expenses. the students charge $4.00 for tickets. there will be one performance of the play in an auditorium that seats 500 people. what is the domain of the function that shows the profit as a function of the number of tickets sold?  

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers