Question

the mean weight of some students in a group is 42kg and the sum of their weights is 504kg ,find the number of students

Answer 1

Answer:

12 student weight is 504 kg

Answer 2

$mean=\frac{sum}{n}$

Step-by-step explanation:

Given:

mean weight: 42kg

sum of all weights: 504 kg

To find: number of students

Solution:

$mean weight=\frac{sum of all weights}{number of students}$

⇒$42=\frac{504}{n}$

⇒$n=\frac{504}{42}$

⇒$n=12$

Hence, the number of students is 12.