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S1 Maths question Help

Exam Mark Group A Group B
20-29 1 1
30-39 3 2
40-49 6 4
50-59 6 13
60-69 11 15
70-79 10 6
80-89 8 3
Work out an estimate for the mean mark for Group A and B?
(edited 8 years ago)
Midpoint x frequency = f(x)

add up f(x) and divide by the total number of students (x)
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bantaland
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Original post by Radical Lemon
Midpoint x frequency = f(x)

add up f(x) and divide by the total number of students (x)


For the mean of Group A i got 51.863. The answer on the book is 63.4. Where did i go wrong?
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bantaland
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Anyone there to help me hurry!!!
Post your working, without seeing that its very difficult to workout the error. Its definitely 63.4 though

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