SSC CGL TRICKS FOR SQUARE ROOT QUESTIONS


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STATISTICS FORMULAES FOR FINDING MEAN, MODE AND MEDIAN

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MEAN FORMULA:- MEAN = (ADDITION OF f i x i) / f i MEAN FORMULA:- MEAN = a + { (ADDITION OF  f i x i) /  f i} * h a = assumed mean  h = class size MODE FORMULA:- MODE = l + [( f1 - f0) / (2f1 - f0 - f2) ] * h l = lower limit of class of which frequency comes f1 = frequency       f1 = n/2 f0 = preciding f0 f2 = after f0 MEDIAN FORMULA:- MEDIAN = l + {(n/2 - cf) / f} * h l = lower limit of class of which frequency comes n = addition of frequency or last number cumulative frequency h = class size SOME OTHER EXAMPLES ARE: SO MEAN OF THIS QUESTION IS: BY DIRECT METHOD:                             = fixi / fi                             = 3620/140                             = 25.86 BY ASSUMED MEAN M...
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MESURATION FORMULAES FOR SQUARE, TRAPEZIUM, RHOMBUS

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SQUARE 1. PERIMETER = 4 * side = 4 * a  WHERE a = SIDE OF SQUARE 2. AREA = (side)^2 3. DIAGONAL = side * sqrt(2) 4. AREA OF THE PATH WHICH IS OUTSIDE OF SQUARE = 4 * (a + x) 5. AREA OF THE PATH WHICH IS INSIDE OF SQUARE = 4 * (a - x) WHERE x = WIDTH OF THE PATH TRAPEZIUM IT IS A QUADRILATERAL WHOSE OPPOSITE SIDES ARE PARALLEL. OTHER TWO OPPOSITE SIDES ARE OBLIQUE. 1. AREA = 1/2 * HEIGHT * (SUM OF PARALLEL SIDES)   HEIGHT IS THE DISTANCE BETWEEN THE TWO PARALLEL SIDES 2. MEDIAN = 1/2 * (SUM OF PARALLEL SIDES) MEDIAN IS THE SEGMENT JOINING THE MIDPOINTS OF OBLIQUE SIDES RHOMBUS IT IS PARALLELOGRAM WHOSE ALL SIDES ARE EQUAL.  ITS DIAGONALS BISECT EACH OTHER AT RIGHT ANGLE. 1. AREA = 1/2 * PRODUCT OF DIAGONALS 2. SIDE = sqrt {(D1/2)^2 + (D2/2)^2} 3. PERIMETER = 4 * SIDE WHERE D1 AND D2 ARE DIAGONALS
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SIMPLE INTEREST AND COMPOUND INTEREST

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