Question

The mean weight of five students is 51 kg and the mean weight of four students is 54 kg. The mean weight of nine students will be​

Answer 1

Answer:

$weight \: of \: 9 \: students \: = 52.33 \: kg \: \\ (more \: than \: 52 \: and \: less \: than \: 53)$

Step-by-step explanation:

$mean \: weight \: of \: 5 \: students = 51kg \\ weight \: of \: 5 \: students \: = 51 \times 5 \\ = 255 \: kg \\ \\again, \\ mean \: weight \: of \: 4 \: students = 54 \: kg \\ weight \: of \: 4 \: students = 54 \times 4 \\ = 216 \: kg \\ \\ weight \: of \: 9 \: students \\ = weight \: of \: 5 \: students + \\ weight \: of \: 4 \: students \\ = 255 \: kg + 216 \: kg \\ = 471 \: kg \\ \\ mean \: weight \: of \: 9 \: students \\ = \frac{sum \: of \: given \: no.}{total \: no.} \\ = \frac{471 \: kg}{9} \\ = 52.33 \: kg$