2,20,110,380,?
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Answer / sumit dheenwal
2 + 18 = 20
20 +90=110
110+270=380
18*5 =90 , 90×3=270, 270×1=270
so add 270 to 380 and get 650 as answer
| Is This Answer Correct ? | 3 Yes | 10 No |
Answer / dall
2 + 18 = 20
20 +90=110
110+270=380
18*5 =90 , 90×3=270, 270×1=270
so add 270 to 380 and get 650 as answer
| Is This Answer Correct ? | 14 Yes | 28 No |
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1. Nine students in a science class separately weighed a small object on the same scale. The weights (in grams) recorded by each student are shown below. 6.2 6.0 6.0 15.3 6.1 6.3 6.2 6.329 6.2 The students want to determine as accurately as they can the actual weight of this object. Of the following methods, which would you recommend they use? a. Use the most common number, which is 6.2 b. Use the 6.329 since it includes more decimal places. c. Add up the 9 numbers and divide by 9. d. Throw out the 15.3, add up the other 8 numbers and divide by 8. 2. The following message is printed on a bottle of prescription medication: WARNING: For application to skin areas there is a 15% chance of developing a rash. If a rash develops, consult your physician. Which of the following is the best interpretation of this warning? a. Don’t use the medication on your skin-- there’s a good chance of developing a rash. b. For application to the skin, apply only 15% of the recommended dose. c. If a rash develops, it will probably involve only 15% of the skin. d. About 15 of 100 people who use this medication develop a rash. e. There is hardly a chance of getting a rash using this medication. 3. The Springfield Meteorological Center wanted to determine the accuracy of their weather forecasts. They searched their records for those days when forecasts had reported a 70% chance of rain. They compared their forecasts to records of whether or not it actually rained on those particular days. The forecast of 70% chance of rain can be considered very accurate if it rained on: a. 95%-100% of those days. b. 85%-94% of those days. c. 75%-84% of those days. d. 65%-74% of those days. e. 55%-64% of those days. 4. A teacher wants to change the seating arrangement in her class in the hopes that it will increase the number of comments her students make. She first decides to see how many comments students make with the current seating arrangement. 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I’m not given enough information about how doctors decided whether or not patients improved. Doctors may have been biased in their judgment. 10. Two containers, labeled A and B, are filled with red and blue marbles in the following quantities. Container Red Blue A 6 4 B 60 40 Each container is shaken vigorously. After choosing one of the containers, you will reach in, without looking, draw out a marble. If the marble is blue, you win $50. Which container gives you the best chance of drawing a blue marble? a. Container A (with 6 red and 4 blue) b. Container B (with 60 red and 40 Blue) c. Equal chances from each container. 11. Which of the following sequences is most likely to result from flipping a fair coin five times? (H=Heads, T=Tails) a. H H H T T b. T H H T H c. T H T T T d. H T H T H e. All four are equally likely Items 12-15 Select one or more explanations for possible coin-flipping outcomes. A = Agree B = Disagree 12. Since coin flipping is random, the coin ought to alternate frequently between landing heads and tails. 13. If you repeatedly flipped a coin five times, each of the sequences would occur about as often as any sequence. 14. If you get a couple of heads in a row, the probability of tails on the next flip increases. 15. Every sequence of five flips has exactly the same probability of occurring. 17. Listed below are the same sequences of H’s and T’s that were listed in Item 11. Which of the sequences is least likely to result from flipping a coin 5 times? a. H H H T T b. T H H T H c. T H T T T d. H T H T H e. All four sequences are equally unlikely Items 17-22 A marketing research company was asked to determine how much money teenagers (ages 13-19) spend on recorded music (cassette tapes, CD’s, and DVD’s). The company randomly selected 80 malls located around the country. 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