Attempt of the following question:

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

Find the mean number of words written.

Attempt of the following question:

If the value of determinant is 31, find the value of m.

Attempt of the following question:

A die is thrown, then find the probability of the following events :
A is an Event : getting an odd number on the upper surface of the die.

Attempt of the following question:

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

Draw pie diagram.

Attempt of the following question:

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