A survey was conducted by a group of students as a part of their environment awareness programme, in which they collected the following data regarding the number of plants in 20 houses in a locality. Find the mean number of plants per house.

Which method did you use for finding the mean, and why?

Find the mean number of plants per house from the following data :

A group of stvdents conducted a survey of their locality to collect the data regarding number of plants and recorded it in the following table : Find the mode for the above data.

In a retail market, fruit vendors were selling mangoes kept in packing boxes. These boxes contained varying number of mangoes. The following was the distribution of mangoes according to the number of boxes. Find teh mean number of mangoes kept in a packing box. Which method of finding the mean did you choose?

Thirty women were examined in a hospital by a doctor and the number of heartper minute were recorded and summarized as follows. Find the mean heart beats per minute for these women, choosing a suitable method.

To find out the concentration of SO_(2) in the air (in parts per million, i.e., ppm), the data was collected for 30 localities in a certain city and is presented below: Find the mean concentration of SO_(2) in the air.

Total number of students of a school in different years is shown in the following table B Prepare another pictograph of students using any other symbol each representing 50 students. Which pictograph do you find more informative?

Form the pair of linear equations in the following problems and find their solutions (if they exist) by any algebraic method : A part of monthly hostel charges is fixed and the remaining depends on the number of days on has taken food in the mess. When a student A takes food for 20 days she has to par Rs. 1000 as hostel charges whereas a student B, who takes food for 26 days, Rs. 1180 as hostel charges. find the fixed charges and the cost of food per day.

Form the pair of linear equations in the following problems and find their solutions (if they exist) by any algebraic method : A part of monthly hostel charges is fixed and the remaining depends on the number of days one has taken food in the mess. When a student A takes food for 20 days she has to pay Rs. 1,000 as hostel charges whereas a student B, who takes food for 26 days, pays Rs. 1,180 hostel charges. Find the fixed charges and the cost of food per day.

Think of this puzzle What do you need to find a chosen number from this square? Four of the clues below are true but do nothing to help in finding the number. Four of the clues are necessary for finding it. Here are eight clues to use: a. The number is greater than 9. b. The number is not a multiple of 10. c. The number is a multiple of 7. d. The number is odd. e. The number is not a multiple of 11. f. The number is less than 200. g. Its ones digit is larger than its tens digit. h. Its tens digit is odd. What is the number? Can you sort out the four clues that help and the four clues that do not help in finding it? First follow the clues and strike off the number which comes out from it. Like - from the first clue we come to know that the number is not from 1 to 9. (strike off numbers from 1 to 9). After completing the puzzle, see which clue is important and which is not?

Can you find a plant in your house or in your neighborhood, which has a long but weak stem? Write its name. In which category will you place it?