# Category Archives: School Learning

Question 1. From the data given below state which group is more variable, A or B? Marks 10 – 20 20 – 30 30 –… Read More
Question 1. Find the mean, variance and standard deviation for the following data: (i) 2, 4, 5, 6, 8, 17 (ii) 6, 7, 10, 12,… Read More
Question 1. If the heights of 5 persons are 140 cm, 150 cm, 152 cm, 158 cm and 161 cm respectively. Find the mean height.… Read More
Question 13. The traffic police recorded the speed (in km/hr) of 10 motorists as 47, 53, 49, 60, 39, 42, 55, 57, 52, 48. Later… Read More
Prove the following identities (1 – 13) Question 1. sec4θ – sec2θ = tan4θ + tan2θ   Solution: We have sec4θ – sec2θ = tan4θ… Read More
Chapter 10 Straight Lines – Exercise 10.2 | Set 1 Question 11. A line perpendicular to the line segment joining the points (1, 0) and… Read More
Problem 1: The marks obtained by 40 students of class VIII in an examination are given below: 16, 17, 18, 3, 7, 23, 18, 13,… Read More
Question 1. Draw a quadrilateral in the Cartesian plane, whose vertices are (– 4, 5), (0, 7), (5, – 5), and (– 4, –2). Also,… Read More
Question 9. One side of a rhombus is of length 4 cm and the length of an altitude is 3.2 cm. Draw the rhombus. Solution: Steps… Read More
Question 1. Find the area of the pentagon shown in figure below, if AD = 10 cm, AG = 8 cm, AH = 6 cm,… Read More
Question 1. Which of the following statements are true for a rhombus? (i) It has two pairs of parallel sides. (ii) It has two pairs… Read More
Find the sum to n terms of each of the series in Exercises 1 to 7. Question 1. 1 × 2 + 2 × 3… Read More
Determine the order and degree of the following differential equation. State also whether it is linear or non-linear(Question 1-13) Question 1.  Solution: We have, Order… Read More
Question 1. Calculate the mean and S.D. for the following data: Expenditure (in ₹): 0-10 10-20 20-30 30-40 40-50 Frequency: 14 13 27 21 15… Read More
The modern computer took its shape with the arrival of your time. It had been around 16th century when the evolution of the computer started.… Read More