Respuesta :

venutad99

Answer:

1.48 meters

Step-by-step explanation:

let the sum of the heights of the girls and the boys be Y and x respectively

[tex] \frac{x}{14} = 1.56 \: \: \: \: \frac{x + y}{32} = 1.515 \: \\ x = 21.84 \: \: \: \: x + y = 48.48 \\ y = 48.48 - 21.84 = 26.64 \\ \: the \: number \: of \: girls \: in \: aclass \: is \: 32 - 14 = 18 \\ then \: the \: mean \: will \: be \: \\ \frac{26.64}{18} = 1.48[/tex]

X=6 x+y=

Answer:

mean (average height) of the girls is 1.48 metres

Step-by-step explanation:

Number of boys × average height  = 14 × 1.56 = 21.84

All students × average height = 32 × 1.515= 48.48

Number of girls × average height = 18 x

32-14 boys = 18 girls

Total height of all = Total height of boys + Total height of girls

 48.48 = 21.84 + 18x

48.48 - 21.84 = 18x

   26.64 = 18x

  26.64 ÷ 18 = x

           1.48 = x the average height of the girls

Otras preguntas