Question

The average height of 25 students out of 40 students in a class is 163cm and the average height of the remaining students is 169 cm then the average height of the students in that class in cm is?

Answer 1

Answer:

Step-by-step explanation:

Answer 2

$<b><u>Given :-</u></b>$

The average height of 25 students = 163 cm

The average height of 15 students = 169 cm

$\rule {330}{4}$

$<b><u>To Find :-</u></b>$

The average height of total students

$\rule {330}{4}$

$<b><u>Solution :-</u></b>$

The sum of the heights of 25 students = Average × No.of Students

= 163 × 25

= 4075 cm

The sum of the heights of 15 students = Average × No.of Students

= 169 × 15

= 2535 cm

•°• The average height of total students = $\sf {\dfrac{Sum\:of\: the\: heights\: of \:25 \:students + Sum \:of\: the\: heights \:of\: 15\: students}{Total \: Students}}$

= $\sf {\dfrac{4075+2535}{40}}$

= $\sf {\dfrac {6610}{40}}$

=165.25 cm

$<b>•°•The average height of total students = 165.25 cm </b>$