Average height

In a class are 34 students. The average height of students is 165 cm. What will be the average height of students in the classroom when two pupils tall 176 cm and 170 cm moved from this school/class?

Result

x =  164.5 cm

Solution:

h=165 34176170=5264 cm n=342=32 x=hn=526432=3292=164.5=164.5  cm h = 165 \cdot \ 34-176-170 = 5264 \ cm \ \\ n = 34-2 = 32 \ \\ x = \dfrac{ h }{ n } = \dfrac{ 5264 }{ 32 } = \dfrac{ 329 }{ 2 } = 164.5 = 164.5 \ \text{ cm }



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