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Math Help - Histogram problem

  1. #1
    Newbie
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    Histogram problem

    Could someone please help me with a histogram problem.I'm having a problem with the the class width.The data is from an experiment to test the compressive strength of load carrying bricks.A sample of 65 bricks were tested to destruction.The results of the test were rounded in class size,correct to 2 decimal places.These are listed below.

    Strength(N/mm^2):10.50 11.47 11.48 11.49 11.50 11.51 11.52 11.54
    Frequency; 2 3 10 17 16 8 5 4

    I'm having a problem with the class width because all the strength data is close together except for the first one which is 10.50 and I can't figure out what to do.Can someone help please.
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by baggie View Post
    Could someone please help me with a histogram problem.I'm having a problem with the the class width.The data is from an experiment to test the compressive strength of load carrying bricks.A sample of 65 bricks were tested to destruction.The results of the test were rounded in class size,correct to 2 decimal places.These are listed below.

    Strength(N/mm^2):10.50 11.47 11.48 11.49 11.50 11.51 11.52 11.54
    Frequency; 2 3 10 17 16 8 5 4

    I'm having a problem with the class width because all the strength data is close together except for the first one which is 10.50 and I can't figure out what to do.Can someone help please.
    What is wrong with the following classes:

    [10.375-10.625), [10.625,10.875), [10.875,11.125), [11.125,11.375), [11.375-11.625) ?

    CB
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