Question

if the average height of 20 girls in class is 30 cm and the average height of 20 boys is 134 what is the average height of all the students in class

Answer 1

Answer:

132cm

Step-by-step explanation:

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Answer 2

Answer:

Average height of class = 132 cm

Step-by-step explanation:

Average = Sum of observations / Number of observations

Average heights of girls = Sum of heights of girls / Number of girls

130 = Sum of heights of girls / 20

Sum of heights of girls = 2600 cm

Similarly, sum of heights of boys = 134 × 20 = 2680 cm

Average height of class = Sum of all heights / Total number of students

= (2600+2680)/40 = 5280/40 = 132 cm