Q3 of 23 Page 1

Attempt of the following question:

Solve the following quadratic equation by using formula method :
5m2 + 5m – 1 = 0

On comparing with the standard equation (ax2 + bx + c = 0), we get,

a = 5 b = 5 c = -1


Roots (α, β) are given by






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2

Attempt of the following question:

Below is the given frequency distribution of words in an essay:



Find the mean number of words written.

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Attempt of the following question:

Subject wise marks obtained by a student in an examination are given below:



Draw pie diagram.

 3

Attempt of the following question:

There are three boys and two girls. A committee of two is to be formed.
Find the probability of the following events:
Event A : The committee contains at least one girl.
Event B : The committee contains one boy and one girl.

 3

Attempt of the following question:

The measurement (in mm) of the diameters of the head of the screws are given below:



Calculate mean diameter of head of a screw by ‘Assumed Mean Method’.