Question

*वर्गातील 20 मुलींच्या उंचीची सरासरी 130 सेमी आहे आणि 20 मुलांच्या उंचीची सरासरी 134 सेमी असल्यास वर्गातील सर्वांच्या उंचीची सरासरी किती ?*

1️⃣ 132.5 सेमी
2️⃣ 133 सेमी
3️⃣ 132 सेमी
4️⃣ 131.5 सेमी​

Answer 1

Answer:

132 is the answer i think so

Answer 2

Given :- If the average height of 20 girls in the class is 130 cm and the average height of 20 boys is 134 cm, what is the average height of all the students in the class?

1) 132.5 cm

2) 133 cm

3) 132 cm

4) 131.5 cm

Answer :-

→ Average height of 20 girls = 130

so,

→ Total height of all girls = 20 * 130

similarly,

→ Average height of 20 girls = 134

so,

→ Total height of all girls = 20 * 134

then,

→ Total height of all students = 20 * 130 + 20 * 134 = 20(130 + 134) = 20 * 264

therefore,

→ Average of all students = Total height of all students / Total number of students = (20 * 264) / 40 = 264/2 = 132 cm. (3) (Ans.)