NCERT Class 7 Mathematics

DATA HANDLING 59 Neelam’s colleague helped her organise the data in the following way (Table 3.4). Table 3.4 Roll No. Names Mark ...

60 MATHEMATICS l The average temperature at this time of the year is about 40 degree Celsius. l The average age of pupils in my ...

DATA HANDLING 61 SOLUTION The average study time of Ashish would be Total number of study hours Number of days for which he stud ...

62 MATHEMATICS 3.5.1 Range The difference between the highest and the lowest observation gives us an idea of the spread of the o ...

DATA HANDLING 63 Following table shows the points of each player scored in four games: Player Game Game Game Game 1234 A 14 16 ...

64 MATHEMATICS 3.6 MODE As we have said Mean is not the only measure of Central tendency or the only form of representative valu ...

DATA HANDLING 65 Look at the following example: EXAMPLE 5 Following are the margins of victory in the football matches of a leag ...

66 MATHEMATICS Heights (in cm) of 25 children are given below: 168, 165, 163, 160, 163, 161, 162, 164, 163, 162, 164, 163, 160, ...

DATA HANDLING 67 3.7 MEDIAN We have seen that in some situations, arithmetic mean is an appropriate measure of central tendency ...

68 MATHEMATICS Note that in general, we may not get the same value for median and mode. Thus we realise that mean, mode and medi ...

DATA HANDLING 69 EXAMPLE 8 Two hundred students of 6th and 7th class were asked to name their favourite colour so as to decide u ...

70 MATHEMATICS 0 100 200 300 400 500 600 Ajay Bali Dipti Faiyaz Geetika Marks out of 600 Hari Students Scale : 1 unit 100 marks ...

DATA HANDLING 71 Let us look at another example more related to us. EXAMPLE 10 A mathematics teacher wants to see, whether the n ...

72 MATHEMATICS (a) Can you work a fraction of the number of watches that leaked to the number tested for each company? (b) Could ...

DATA HANDLING 73 (iii) In which years were fewer than 250 books sold? (iv) Can you explain how you would estimate the number of ...

74 MATHEMATICS 9 CHANCE AND PROBABILITY These words often come up in our daily life. We often say, “there is no chance of it ra ...

DATA HANDLING 75 |||| |||| |||| |||| |||| |||| ||| |||| |||| |||| |||| |||| |||| |||| ||||| |||| |||| |||| |||| |||| |||| |||| | ...

76 MATHEMATICS between 0 and 1. Those which have no chance of happening have probability 0 and those that are bound to happen ha ...

I L ATI N 77 4.1 A MIND-READING GAME! The teacher has said that she would be starting a new chapter in mathematics and it is goi ...

78 MATHEMATICS To find the number thought by Sara let us work backward from her answer 65. We have to find x such that 4 x + 5 = ...