Add together the values for July, August and September for whatever variable you are studying.
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If you have 2n scores, then Q1 = (2n+1)/4 Q3 = 3*Q1 In both cases, depending on your level, you take the nearest integer to Q1 and Q3, or you interpolate. If you do not know what interpolate means then you are probably not yet at the necessary level! and IQR = Q3 - Q1
q3 + 2336 is an algebraic expression which cannot be simplified.
coefficient of quartile deviation is = (q3-q1)/(q3+q1)
(q3-q1)/2
The semi interquartile range is a measure for spread or dispersion. To find it you have to subtract the first quartile from Q3 and divide that by 2, (Q3 - Q1)/2