1. Frequency Distribution Table (Mathway) 2. Mean Relative Frequency= ∑fM∑f= 143821 = 68.50 (Mathway) Mean of all Data = ∑xn= 1484.921 = 70.710 The two values are different because in the first method, the midpoint of every class produces an average value of that class. The sum of the midpoints differ from the sum of all values, and as such they will have different mean values since both will be divided by the total frequency. 3. Chebyshev’s Rule 80 %= 0.8 = 1- [1/(k^2)]; k = square root of (1/0.2) = 2.236 deviation from the mean=k x standard deviation=2.236 x 29.285=65.483
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