Arrange the numbers in increasing order first and find the range with the help of maximum and minimum number.

Try to recall the formula for mean.

What is the most common age of the students?

How can we find the median of the data when number of entries are even?

Try to make tally table for the above.

We are going to use a variable in this question. For consecutive odd numbers, we need to skip one number

Look for the number(s) which appears maximum number of time,

Try to look for the number which occured maximum number of times.

Use the sum of all her marks and then try to find the average.

Remeber the method which we were doing to find the average.