Y9. Calculating Statistics. More Difficult Questions

  1. A basketball player scores an average of 18.6 points per game for five games. How many points must she score in the next game to raise her average to 20 points per game?
  2. What is the average of 7 numbers if the average of the first two is 9 and the average of the last 5 is 16?
  3. 42 is the arithmetic mean of a group of 30 numbers. If two numbers, 82 and 44, are removed, then what is the arithmetic mean of the remaining group of numbers?
  4. John’s average in five maths tests was m. After a sixth test her average was n. If the teacher then decides to double the weighting of the last test, what will John’s average be?






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