Question

weight ( in kg) of 20 students is given below calculate the mean weight weight ( in kg) 42 43 44 45 46 47 number of students 4 3 3 6 2 2 ​

Answer 1

The total number of students is 20.

The data of the weight of students is given.

4 students have a weight of 42, 3 students have a weight of 43, 3 students have a weight of 44, 6 students have a weight of 45, 2 students have a weight of 46, and 2 students have a weight of 47.

• The mean will be calculated as

Mean weight = sum of the weight of all the students/ total number of students.

mean weight = $\frac{42*4 + 43*3 + 44*3 + 45*6+ 46*2 + 47*2}{20}$

                       =$\frac{168 + 129 + 132 ++270 + 92 + 94}{20}$

                       = $\frac{885}{20}$

                       =$44.25$

The mean weight will be 44.25 kg

Answer 2

From the given question the correct answer is:

the mean weight of 20 students is 44.25

Given:

weight of 20 student

i.e 42 43 44 45 46 47

To find :

mean weight

Solution:

we have to find the mean of weight of student

mean is the average of all numbers.

4 students have a weight of 42.

3 students have a weight of 43.

3 students have a weight of 44.

6 students have a weight of 45.

2 students have a weight of 46.

2 students have a weight of 47.

the weight of 20 student are  

i.e= 42,42,42,42,43,43,43,44,44,44,45,45,45,45,45,45,46,46,47,47

  so, we will Add the weight of all the 20 students and divide it by  total number of students.

∴ mean of weight of 20 students =

$\frac{ 42+42+42+42+43+43+43+44+44+44+45+45+45+45+45+45+46+46+47+47}{20}$

=$\frac{885}{20}$

=44.25

Hence, the mean weight of 20 students is 44.25