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    I'm revising at the moment and I'm stuck on this excercise:

    This table shows the age distribution of the teachers who smoke at Laghlin high School.

    Age Number of Smokers

    20 < x < 30 5
    30 < x ​< 40 4
    40 < x ​< 50 3
    50 < x ​< 60 2
    60 < x ​< 70 3

    a) Calculate an estimate of the mean smoking age.

    Any idea how to solve this one? Is there any formula for an estimated mean and if there is, could someone give it?

    you have to fine the mid point of the inequality so for example the first one would be 25. once you have found all the mid point we have to times each one by the frequency witch is the number of smokers. Once you have done that add up all of the numbers you have just found out and dived that number but the total frequency
    hope it helps
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