Question

Q1 Marks obtained by students of class 7 in mathematics are as follows: 4, 6, 3, 7, 5, 8, 9, 7, 5, 8, 4, 3, 4, 8, 9, 10. What is the range of the marks? *

4
5
6
7
Q2 What is the arithmetic mean of the marks obtained in question 1. *

5.50
6.25
5.25
5.55
Q3 what is the mean of the first four even numbers? *
1 point
4
6
8
5
Q4 The ages (in years) of 9 students of a class are: 13, 16, 12, 14, 19, 12, 14, 13, 14. Find the mode of the the data. *

13
12
14
19
Q5 Calculate the median of the data provided in question 4. *

14
12
13
15

Answer 1

Answer:

1. Range = Max. marks – Min. marks

= 9 – 1 = 8

2. Sum of all the observations = 4 + 6 + 7 + 5 + 3 + 5 + 4 + 5 + 2 + 6 + 2 + 5 + 1 + 9 + 6 + 5 + 8 + 4 + 6 + 7

= 100

Total number of observations = 20

Arithmetic mean = Sum of all the observations/Total number of observations

= 100/20

= 5

3. First Four Even Numbers = 2,4,6,8.

2+4+6+8 = 20.

Mean = 20/4 = 5.

4. To find out mode we have to arrange the raw data in organised data. Organised data = 12,12,13,13,14,14,14,16,19. Here 14 occurs most frequently (3 times). So mode is 14.

5. To find out median we have to arrange the raw data in organised data. Organised data = 12,12,13,13,14,14,14,16,19. So median = 14.

Hope it helps you

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