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    its on standard deviation btw...

    The marks of 10 students on a test were found to have the mean of 75 and standard deviation of 8.

    a i) find the total of the 10 marks
    ii) show that the value of signma x^2 is 56,890
    b) When the marks were checked it was discovered that one of the marks was incorrect. A mark of 68 should have been 86. Calculate the mean and standard deviation of the corrected marks.


    so confused, been spending so long on it, :/
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    Which parts are you struggling with? Do you have any workout out/answers already?
 
 
 
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