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Math Help - Help with area and means

  1. #1
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    Help with area and means

    hello is there anybody that can explain how to work out these questions, i would really appreciate it.

    Q1. Find the area of this shape.

    Q2. In Class A the mean average score in a French exam was 72%. In Class B the mean average score in a French exam was 84%. There are 30 students in Class A and 26 students in Class B.

    Calculate the mean average score for the two classes combined. Give your answer to 3 significant figures.
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  2. #2
    Super Member Deadstar's Avatar
    Joined
    Oct 2007
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    Well for the first part the area of the square is just 8 x 8 = 64
    The area of a circle is \pi r^2 so the area of a semi circle is just that divided by 2 which in this care is 8 \pi
    So total area is 64 + 8 \pi

    For the second part i would do the sum 0.72 x 30 + 0.84 x 26

    and then divide this by the total number of students which is 56. So the answer is 0.776 to 3 decimal places
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