Chapter 15 Probability Ex 15.1 eng
Chapter 15 Probability Ex 15.1 Question 1. In a cricket match, a batswoman hits a boundary 6 times out of 30 balls she plays. Find the probability that she did not hit a boundary. Solution: Question 2. 1500 families with 2 children were selected randomly, and the following data were recorded Compute the probability of […]
Chapter 14 Statistics Ex 14.4 eng
Chapter 14 Statistics Ex 14.4 Question 1. The following number of goals were scored by a team in a series of 10 matches 2, 3, 4, 5, 0, 1, 3, 3, 4, 3. Find the mean, median and mode of these scores. Solution: (iii) Mode Arranging the given data in ascending order, we have 0, […]
Chapter 14 Statistics Ex 14.3 eng
Chapter 14 Statistics Ex 14.3 Question 1. A survey conducted by an organisation for the cause of illness and death among the women between the ages 15-44 (in years) worldwide, found the following figures (in %) (i) Represent the information given above graphically. (ii) Which condition is the major cause of women’s ill health and […]
Chapter 14 Statistics Ex 14.2 eng
Chapter 14 Statistics Ex 14.2 Question 1. The blood groups of 30 students of class VIII are recorded as follows A, B, 0, 0, AB, 0, A, 0, B, A, 0, B, A, 0, 0, A, AB, 0, A, A, 0, 0, AB, B, A, 0, B, A, B, 0 Represent this data in the […]
Chapter 14 Statistics Ex 14.1 eng
Chapter 14 Statistics Ex 14.1 Question 1. Give five examples of data that you collect from your day-to-day life. Solution: Five examples of data that we can gather from our day-to-day life are (i) number of students in our class. (ii) number of fans in our class. (iii) electricity bills of our house for last […]
Chapter 13 Surface Areas and Volumes Ex 13.9 eng
Chapter 13 Surface Areas and Volumes Ex 13.9 Question 1. A wooden bookshelf has external dimensions as follows : Height = 110cm, Depth = 25cm, Breadth = 85cm (see figure). The thickness of the plank is 5 cm everywhere. The external faces are to be polished and the inner faces are to be painted. If […]
Chapter 13 Surface Areas and Volumes Ex 13.8 eng
Chapter 13 Surface Areas and Volumes Ex 13.8 Question 1. Find the volume of a sphere whose radius is (i) 7 cm (ii) 0.63 cm Solution: (i) We have, r = 7 cm Question 2. Find the amount of water displaced by a solid spherical ball of diameter (i) 28 cm (ii) 0.21 m Solution: […]
Chapter 13 Surface Areas and Volumes Ex 13.7 eng
Chapter 13 Surface Areas and Volumes Ex 13.7 Question 1. Find the volume of the right circular cone with (i) radius 6 cm, height 7 cm (ii) radius 3.5 cm, height 12 cm Solution: (i) We have, r = 6 cm and h = 7cm Question 2. Find the capacity in litres of a conical […]
Chapter 13 Surface Areas and Volumes Ex 13.6 eng
Chapter 13 Surface Areas and Volumes Ex 13.6 Question 1. The circumference of the base of a cylindrical vessel is 132 cm and its height is 25 cm. How many litres of water can it hold? (1000cm3 =1 L.) Solution: We have, circumference of the base = 132 cm ∴ 2πr = 132 Question 2. […]
Chapter 13 Surface Areas and Volumes Ex 13.5 eng
Chapter 13 Surface Areas and Volumes Ex 13.5 Question 1. A matchbox measures 4 cm x 2.5 cm x 1.5 cm. What will be the volume of a packet containing 12 such boxes? Solution: Volume of a match box = 4 cm x 2.5 cm x 1.5 cm= 15 cm3 Volume of a packet = […]