The Mean from a Frequency Table. It is easy to calculate the Mean: Add up all the numbers, then divide by how many numbers there are.
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In this video, Professor Curtis uses StatCrunch to demonstrate how to find the mean of a frequency distribution (MyStatLab ID# 3.1.29).Be sure to subscribe t
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Now if middle point is 20 and length of class interval is 10, then interval is 15-25. This we get by subtracting and adding 5 (Half of the interval). So applying same to all the mid points we get
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