The mean of three numbers is 10. The mean of other four numbers is 12. Find the mean of all the numbers.

The marks in a subject for 12 students are as follows:

31, 37, 35, 38, 42, 23, 17, 18, 35, 25, 35, 29

For the given data, find the

(a) Range (b) Mean

(c) Median (d) Mode

The heights of 10 girls were measured in cm and he results are as follows:

135, 150, 139, 128, 151, 132, 146, 149, 143, 141.

(i) What is the height of the tallest girl?

(ii) What is the height of the shortest girl?

(iii) What is the range of the data?

(iv) What is the mean height of the girls?

(v) How many girls have heights more than the mean height?

The enrolment in a school during six consecutive years was as follows:

1555, 1670, 1750, 2013, 2540,2820

Find the mean enrolment of the school for this period.

The marks (out of 100) obtained by a group of students in a science test are 85, 76, 90, 85, 39, 48, 56, 95, 81 and 75.

Find the:

(i) Highest and the lowest marks obtained by the students.

(ii) Range of the marks obtained.

(iii) Mean marks obtained by the group.

The following are weights (in kg) of 12 people.

70, 62, 54, 57, 62, 84, 75, 59, 62, 65, 78, 60

A. Find the mean of the weights of the people.

B. How many people weigh above the mean weight?

C. Find the range of the given data.

Find the median of first nine even natural numbers.

Find the median of the given data if the mean is 4.5.

5, 7, 7, 8, x, 5, 4, 3, 1, 2

Find the mean of the first ten even natural numbers.

State whether the statements are True or False.

Mean can never be a fraction.

State whether the statements are True or False.

Mean of the data is always from the given data.