Question

Choose the correct options:
1. The mean of first 12 natural numbers is.
(0) 6.5
(ii) 5.5
(iii)45
(iv) None of these

2. A class which has maximum frequency in a grouping of data is called
(i) Mean
(ii) Median class
(iii) Modal class
(iv) None of these

3. From which of the following is called economic barometers.
(i) Index numbers
(ii) Median
(iii) Mode
(iv) None of these

4. If the mean of the series is 20. What is the value of X? series like 10.15
X, 20, 30
(i) 10
(ii) 15
(iii) 20
(iv) 25

5. Number of quadrants are there in a graph paper is :
(i) 1
(ii) 2
(iii) 3
(iv) 4


write answer of all Question​

Answer 1

Answer:

1. (i) 6.5

2. (iii) Modal class

3. (i) Index numbers

4. (iv) 25

5.(iv) 4

Explanation:

1.

Mean = sum of elements / no. of elements

Sum of natural number = n (n+1) = 12(12+1) = 12*13

2 2 2

Sum = 156/2 = 78

Mean = 78 / 12 = 6.5

4.

Mean = sum / no. of elements

=> 20 = 10+15+X+20+30

5

=> 20 = 75+X

5

=> 20*5 = 75 + x

=> 100 = 75 + x

=> x = 100 - 75 = 25