The number of Sci

1. Write the scores in the 1st column, in ascending order as x₁< x₂< x₃...

2. Write the tally marks in the next column.

3. Count the tally marks of scores and write the frequency of the score, denoted as f_i

4. Write the sum of all frequencies below the frequency column.

5. The total frequencies are denoted by ‘N’.

6. In the last column write the products Find f_i x_i

Formula

Where, x_i = score ; f_i = frequency ; N = total frequency

Mean

= 2.75