please provide complete solutions in steps for these questions.. thanks

6. (a) Calculate standard deviation : 5-10 10-15 15-20 20-25 25-30 30-35 2 9 29 24 11 6 (b) Calculate mean deviation from median : X 4 6 8 10 12 14 16 3 6 4 3 7. (a) Fit a curve of farm y = act to following data : X 0 2 3 y 1.05 2.10 3.85 8.30 (b) By method of least square, find the straight line that best fit for the following data : X 2 3 4 5 14 27 40 55 68 8. (a) Fit a second degree parabola to following data : X 1.0 1.5 2.0 2.5 3.0 3.5 4.0 f 1.1 1.3 1.6 2.0 2.7 3.4 4.1 (b) Using method of least square fit the curve y = ax to following data : X 2 3 4 5 V 0.5 2 4.5 8 12.5