Q Answer Mark Comments 6(a) B2 B1 one error Histogram or frequency polygon with Ignore lines before (5, 36) and after (35, mid-points of bars and vertices of 12) if polygon drawn polygon at (5, 36), (15, 34), (25, 18) and (35, 12) 6(b) M1 30 6 (18 + 12)  oe 600 NB table can be seen if necessary. 100 180 A1 SC1 30% stated as answer SC1 for 420 as answer 7 2 4 + 3 3 + 5 1    M1 22 has to come from correct working or 8 + 9 + 5 (30 their 22) 4 M1Dep Their 22 + 4a = 30 – ÷ 2 A1 First M must be scored 7 Guess a value for and correctly a M1 Alt 1 works out ∑xf Guesses a second value nearer to the correct answer and correctly works M1Dep out ∑xf 2 A1 First M must be scored
Q Answer Mark Comments 6(a) Histogram or frequency polygon with mid-points of bars and vertices of polygon at (5, 36), (15, 34), (25, 18) and (35, 12) B2 B1 one error Ignore lines before (5, 36) and after (35, 12) if polygon drawn 6(b) 6  (18 + 12) NB table can be seen if necessary. M1 30 oe 600 100 180 A1 SC1 30% stated as answer SC1 for 420 as answer 7 2  4 + 3  3 + 5  1 or 8 + 9 + 5 M1 22 has to come from correct working (30 – their 22) ÷ 4 M1Dep Their 22 + 4a = 30 2 A1 First M must be scored 7 Alt 1 Guess a value for a and correctly works out ∑xf M1 Guesses a second value nearer to the correct answer and correctly works out ∑xf M1Dep 2 A1 First M must be scored