NCERT Figure it Out 3 - Q6 - Tales by Dots and Lines
Question: Class average height was 150.2 cm. Two new students join. (i) What must be true before claiming the new average? (ii) New heights 149 cm and 152 cm - does the average rise, fall, or stay? (iii) What about the median?
Answer: (i) Need new heights (c). (ii) Mean increases (b). (iii) Insufficient for median (d).
Full step-by-step NCERT solution with diagrams on Something by Zero.