Question

1.Calcule a media aritmética dos números :

a) 12,27,31,40,19,21. b) 22,29,33,15,34.

2. qual a media aritmética de 13,4 e 25,2?

3. Calcule a media aritmética dos numeros :

a) 38,68,62 b) 54,71,47,63

Answer 1

1.a)         (12 + 27 + 31 + 40 + 19 + 21) : 6 = 150 : 6 = 25
   b)         (22 + 29 + 33 + 15 + 34) : 5 = 133 : 5 = 26,6

2.    (13,4 + 25,2) : 2 = 38,6 : 2 = 19,30

3. a)   (38 + 68 + 62) : 3 = 168 : 3  = 56
    b)   (54 + 71 + 47 + 63) : 4 = 235 : 4 = 58,75

Answer 2

1- a) 6x = (12 + 27) + (31 + 40) + (19 + 21)

6x = 39 + 71 + 40

6x = 110 + 40

6x = 150

x = 150/6

x = 25

b) 5x = (22 + 29) + (33 + 15) + 34

5x = 51 + 48 + 34

5x = 99 + 34

5x = 133

x = 133/5

x = 26.6

2- 2x = 13.4 + 25.2

2x = 38.6

x = 38.6/2

x = 19.3

3- a) 3x = 38 + 68 + 62

3x = 106 + 62

3x = 168

x = 168/3

x = 56

b) 4x = (54 + 71) + (47 + 63)

4x = 125 + 110

4x = 235

x = 235/4

x = 58.75