Age group Frequency (f) Mid value (x) f*x (f* x )* x 10 - 20 15 45 675 20 - 30 14 25 350 8750 30 40 15 35 525 18375 40 50 16 45 720 32400 50 60 15 55 825 45375 60 - 70 13 65 845 54925 70 80 4 75 300 22500 n = 80 3610 f * x2 * x = = 183000 Mean = Efx 3610 = 45.125 80 (3610)2 183000 80 standard deviation = 15.9504 %3D n-1 80-1 D. Focus

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Vertices Of An Ellipse

In the study of the conic section of the geometry, An ellipse is a plane curve surrounding two focal points, or foci where the set of all locus of points in the plane has their sum of the distances to the two foci is constant. On the ellipse curve, it is the intersection point of the main axis. In an ellipse graph, the center of the axis is the midpoint of the line segment connecting the foci. The major axis is the line section that runs through the ellipse's foci, while the minor axis runs through the middle and is perpendicular to the major axis.. The ellipse has two endpoints on the major axis which are known as the vertices (in plural), vertex in the singular. The equation of the major axis is 2a, the equation of the minor is 2b and the distance between the major axis and minor axis is 2c. The semi-major axis has a length of a and the semi-minor axis has a length of b. The ellipse's vertices are determined by the elliptical orbit's equation and graph.