Past record shows that machine A produced 60% of the items of output and machine B produced 40% of the items. A two-headed coin will always show heads. The paint in a certain container is sufficient to paint an area equal to 9. Answer : Let E1 and E2 be the respective events that a person has a disease and a person has no disease. The length, breadth and height of a room are 5 m, 4 m and 3 m, respectively. You can share it in the below-given comments section. A village, having a population of 4000, requires 150 litres of water per head per day.
The solutions given for the problems in this chapter will help the students to become aware of the basic concept of Surface areas and volumes. Find the surface area of a sphere of radius: i 10. No, Jerome did not like their reaction. A matchbox measures 5cm × 1cm × 3. While packing the hamper, George and Harris do a number of foolish and funny things.
Find i surface area of the sphere, ii curved surface area of the cylinder, iii ratio of the areas obtained in i and ii. This chapter is extremely crucial for the class 7 exam and students need to be thorough with all the concepts to be able to comprehend many topics in the later grades easily. Drivers add to the confusion by getting into a row over their right of way, and nearly come to blows. The mathematics subject of this class plays a very important role in further studies. A student is selected at random. The bigger of dimensions 25 cm x 20 cm x 5 cm and the smaller of dimensions 15 cm x 12 cm x 5 cm. Each cone has a base diameter of 40 cm and height 1 m.
Answer : Let A, E1, and E2 respectively denote the events that a person has a heart attack, the selected person followed the course of yoga and meditation, and the person adopted the drug prescription. For other questions please visit to or or or or or or or or go for Solutions. He pretended that the lemons were rats and went into the hamper to kill three of them before being hit with a frying pan by Harris. A heap of wheat is in the form of a cone whose diameter is 10. Give reasons for your answer. In this chapter, several examples are given to help the students get completely acquainted with the terminologies and the methods of solving different questions. It is given that 90% of the people are right-handed.
This solution is prepared by our hard work and highly knowledgable teachers. Answer : Let X denote the number of balls marked with the digit 0 among the 4 balls drawn. He wondered whether he had packed his toothbrush or not. For all the overlaps, 5% of the total surface area is required extra. Find the breadth of the tank, if its length and depth are respectively 2.
In the earlier classes, you have also learnt to find the surface areas and volumes of cuboids, cubes and cylinders. For other questions please visit to or or or or or or or or go for Solutions. At first, this chapter introduces the concept of surface area of a cuboid and a cube and then to the surface area of a right circular cylinder, cone, sphere. Video Solution Answer: The shape of the well will be cylindrical. Find also the ratio of the volumes of the two solids obtained in Questions 7 and 8. Answer : Let H denote the students who read Hindi newspaper and E denote the students who read English newspaper. Ncert Solutions for Class 9 Maths has been divided into various chapters in which there is various kind of problems and exercises with their particular concept.
It is strongly recommended that students prepare the answer based on their own experience. What is the probability of this person being male? Tick the statements that are true. Hence, the unit of measurement of either of the two is cubic unit. The measure of this occupied space is called the Volume of the object. The conditional probability of obtaining the sum equal to 8, given that the red die resulted in a number less than 4, is given by P E F. The diameter of the moon is approximately one fourth of the diameter of the earth.
Visit to main page or move to of the page. This gives them a feeling of having accomplished something. You will also learn about the direction cosines, parallel and perpendicular ratios and so on. For all the overlaps, 5% of the total surface area is required extra. Statements i , iii , iv , vi and vii are true. Find the volume of the box.
Answer : Let E1 and E2 be the events of selecting first bag and second bag respectively. Two cards can be drawn out of 12 diamond cards in ways. Answer : A coin is tossed six times and X represents the difference between the number of heads and the number of tails. The students of a Vidyalaya were asked to participate in a competition for making and decorating penholders in the shape of a cylinder with a base, using cardboard. Once he had to reopen the bag as he had forgotten to pack the boots.
This chapter requires practice, so spare some extra time and make sure that you practice this chapter thoroughly. The topics and sub-topics in Chapter 13 Probability 13. Determine the volume of a packet containing 14 such boxes. Though Jerome takes pride in his packing skills, he unpacks and re-packs the same things three times, much to the amusement of his friends and readers. A dome of a building is in the form of a hemisphere.