Question 7 - Figure it out - Page 129-134 - Chapter 5 Class 7 - Connecting the Dots... (Ganita Prakash II)

Transcript

Question 7 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? (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.Our answer is (d) The mean height of students in the other section cannot be determined. Because if one class has a specific average height doesn't force the other class to be the same. The other class might have taller students or shorter students purely by chance. They are separate groups of people.