There are two 7th grade sections at a school. Each section has 15 boys and 15 girls. Class 7
mediumThere are two 7th grade sections at a school. Each section has 15 boys and 15 girls. Class 7
Question 1.
There are two 7th grade sections at a school. Each section has 15 boys and 15 girls. In one section, the mean height of students is 154.2 cm. From this information, what must be true about the mean height of students in the other section? Class 7
(a) The mean height of students in the other section is 154.2 cm.
(b) The mean height of students in the other section is less than 154.2 cm.
(c) The mean height of students in the other section is more than 154.2 cm.
(d) The mean height of students in the other section cannot be determined.
Solution:
(d) is true.
Question 2.
Standing tall in the storm. Class 7
(a) Write estimated values for the number of skyscrapers in New York, Tokyo, and London.
(b) Are the following statements valid?
(i) Only 12 cities have more skyscrapers than Mumbai.
(ii) Only 7 cities have fewer skyscrapers than Mumbai.
(iii) The tallest building in the world is in Hong Kong.
Solution:
(a) New York : 300; Tokyo : 160; London : 35.
(b) (i) Yes
(ii) Yes
(iii) No.