Question

the mean height of 10 girls is 145 centimetre and that of 30 boys is 152 metre find the new mean height of the group of 40 students​

Answer 1

Answer:

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Answer 2

$\huge{\boxed{\red{\bf{Question:-}}}}$

The mean height of 10 girls is 145 cm. and that of 30 boys is 152 cm. Find the new mean height of the group of 40 students.

$\huge{\boxed{\red{\bf{Solution:-}}}}$

Mean height of 10 girls = 145 cm.

Then,

their total height = (145×10)cm. = 1450 cm.

Mean height of 30 boys = 152 cm.

Then,

their total height = (152×30)cm. = 4560 cm.

Total height of the 40 students = (4560+1450)cm.

= 6010 cm.

${\boxed{{Mean}=\frac{Sum \: of \: heights \: of \: 40 \: students}{Total \: no. \: of \: students}}}$

${Mean}=\frac{6010}{40}$

${Mean}={150.25 cm.}$

$\huge{\boxed{\red{\bf{Answer:-}}}}$

The new mean height of 40 students is 150.25 cm.