Maths The ages, in years, of 10 horses in a field were 3, 3, 4, 5, 7, 7, 7, 8, 8, 8,<p> Which one of the following is true? 1 mean = (3+3+4+5+7+7+7+8+8+8)/10 = 6<p> median = 7 i.e the middle number<p> range = 8-3 = 5 At a college, students are given a points score calculated from their GCSE grades.<p> Someone with 4 A grades and 4 B grades gains a score of 36 points.<br>Someone with 2 A grades and 4 B grades gains a score of 26 points.<br>Someone with 3 A grades and 3 B grades would have a score of 1 4A + 4B = 36 and 2A + 4B = 26<p>solving simultaneously gives A = 5 and B = 4 A sequence consists of adding the previous three terms together to form the next term. The first three terms of the sequence are 1, 2, 3.<p> What is the sixth term in the sequence? 1 1, 2, 3, 6, 11, ... The value of an item is described as decreasing exponentially. Which description below best matches this statement? 1 No hint - you either know this or you don't! Consider the statement<p> "Schools with high numbers of pupils on free school meals do not do well in league tables."<p> Which of the following statements follows logically from the one above? 1 Factors other than the number of pupils on free school meals affect how well a school does in league tables. The force between two point electric charges is inversely proportional to the square of their distance apart. What effect does doubling this distance have on the force? 1 Inversely proportional means that increasing the distance decreases the force.<br>2 squared gives 4. Two of the five playing cards that Colin has are aces. He shuffles the five cards, then puts them face down on the table. Madge takes a card and then another. The probability that she now has <b>both</b> of the aces is 1 2/5 x 1/4 A college's guidelines say that classes must have a minimum of 12 students and a maximum of 20 students. For what numbers of students studying a particular subject is it impossible to run classes without breaking the guidelines? 1 between 12 and 20 students - one class<br> between 24 and 36 students - two classes<br> between 36 and 40 students - two classes The ages of two friends are in the ratio 3:4. In 8 years time their ages will be in the ratio 5:6. How old are they now? 1 (12+8):(16+8) = 20:24 = 5:6 A heavy construction vehicle travels for 40 minutes between sites, at an average speed of 16 km per second. The distance between sites is 1 16/60 x 40