Buzz·Posted on Mar 14, 2016Could You Actually Pass GCSE Stats Now?You can use a calculator – it's pretty hard. Questions adapted from AQA "Statistics and Number" past papers.by Tom ChiversBuzzFeed Science WriterFacebookPinterestTwitterMailLink ThinkStock / BuzzFeed 15 Correct Incorrect 15 25 Correct Incorrect 25 5 Correct Incorrect 5 35 Correct Incorrect 35 Correct! Wrong! A quarter of the balls are green, so 25 greens. There are twice as many blues as greens, so 50 blues. There are one-fifth as many reds as blues, so 10 reds. Add them together and you get 85, so the remaining 15 must be white. Via ThinkStock ThinkStock / BuzzFeed 23.5 Correct Incorrect 23.5 11.1 Correct Incorrect 11.1 14.4 Correct Incorrect 14.4 20 Correct Incorrect 20 Correct! Wrong! 1430 - 1250 = 180. 180 ÷ 1250 = 0.144. 0.144 x 100 = 14.4. ThinkStock 0.5 Correct Incorrect 0.5 0.9 Correct Incorrect 0.9 0.4 Correct Incorrect 0.4 0.7 Correct Incorrect 0.7 Correct! Wrong! 28 ÷ 40 = 0.7. ThinkStock / BuzzFeed 6 red, 3 white, 1 blue Correct Incorrect 6 red, 3 white, 1 blue 5 red, 3 white, 2 blue Correct Incorrect 5 red, 3 white, 2 blue 7 red, 2 white, 1 blue Correct Incorrect 7 red, 2 white, 1 blue 8 red, 1 white, 1 blue Correct Incorrect 8 red, 1 white, 1 blue Correct! Wrong! You'd expect 7 out of 10 reds to give a relative frequency of 0.7. 25 : 18 Correct Incorrect 25 : 18 2 : 1 Correct Incorrect 2 : 1 32 : 11 Correct Incorrect 32 : 11 9 : 7 Correct Incorrect 9 : 7 Correct! Wrong! You multiply the ratios together, so it's (10 x 5) : (5 :4), or 50 : 36. Then you need to see if both sides can be divided by anything to give you the simplest version. In this case, dividing them both by 2 gives you 25 : 18. ThinkStock / BuzzFeed £6,500 Correct Incorrect £6,500 £6,775 Correct Incorrect £6,775 £7,225 Correct Incorrect £7,225 £7,775 Correct Incorrect £7,775 Correct! Wrong! The way to work it out is 9,000 ÷ 1.05^3 = 7,774.54. ThinkStock / BuzzFeed Yes Correct Incorrect Yes No Correct Incorrect No Correct! Wrong! 24 ÷ 40 = 0.6, so less than 2/3rds. ThinkStock / BuzzFeed 8 Correct Incorrect 8 9 Correct Incorrect 9 12 Correct Incorrect 12 15 Correct Incorrect 15 Correct! Wrong! There are three possible "starter and main" combinations, and six possible "main and dessert" combinations, for a total of nine. ThinkStock / BuzzFeed 1/5 Correct Incorrect 1/5 2/5 Correct Incorrect 2/5 1/3 Correct Incorrect 1/3 2/3 Correct Incorrect 2/3 Correct! Wrong! There are nine possible combinations; three of them include jelly. So it's 3/9 or 1/3. ThinkStock / BuzzFeed 5 Correct Incorrect 5 9 Correct Incorrect 9 11 Correct Incorrect 11 13 Correct Incorrect 13 Correct! Wrong! You know that spruce trees + pine trees + 2 = fir trees. 27 fir trees and 16 pine trees have been sold. So 27 - 26 - 2 = 9. ThinkStock / BuzzFeed 4.4 x 10^5 Correct Incorrect 4.4 x 10^5 4.4 x 10^6 Correct Incorrect 4.4 x 10^6 4.4 x 10^8 Correct Incorrect 4.4 x 10^8 4.4 x 10^523 Correct Incorrect 4.4 x 10^523 Correct! Wrong! The correct answer is 437,062, or 4.4 x 10^5.
