Question

Recently the half yearly examination was conducted in DAV public school.
The mathematics teacher maintains a record of the marks of 100 students on
the basis of the recorded data of the Marks obtained in mathematics.
That histogram is given below:
35
20
No. of students
on to ti åh w
20
40
60
80
100
Marks
On the basis of the above histogram answer the following questions
(i) Identify the model class from the given graph
(a) 80-100
b) 20 - 40
c) 60 - 80
d) 40 - 60
(ii) Find the mode of the distribution of marks obtained by the students in the
examination
(a) 78
b) 68
c) 48
d) 58
(iii) Given that the mean of the above distribution is 53. using empirical
relationship estimate the value of its median
(a) 78
b) 68
c) 48
d) 58
(iv) The constructions of cumulative frequency table is useful in determining
the
(a) median b) mean
c) Mode
d) all of the above
(v) Which one is the median class?
(a) 80 - 100
b) 20 - 40
c) 60 - 80
d) 40 - 60​

Answer 1

Answer:

Square Root :

If x2 = y then we say that square root of y is x and we write √y = x

So, √4 = 2, √9 = 3, √36 = 6

Cube Root:

The cube root of a given number x is the number whose cube is x.

we can say the cube root of x by 3√x

√xy = √x * √y

√x/y = √x / √y = √x / √y x √y / √y = √xy / y.

Answer 2

Answer:

i) c.60-80

ii) b. 68

iii) d. 58

iv) a. median

v) b. 80