If the weights of five chicks in kilograms are 2.5, 2.0, 4.2, 3.0, and 9.3, then the mean weight of the chicks are A. 3.5kg B. 4.2kg C. 4.0kg D. 3.0kg

B

Step-by-step explanation:

The mean is calculated as

mean =

          =

          = = 4.2 Kg → B

4.2 kg

Step-by-step explanation: the mean formula is the total of the values divided by the number of values which equals: 2.5 + 2.0 + 4.2 + 3.0 + 9.3 = 21 ÷ 5 ( the number of chicks) = 4.2kg.

1.4

2.3

step-by-step explanation:

the formula for the constant of variation is

y= kx

divide each side by x

y/x =kx/x

y/x =k

we know a and y

1.   y/x = k

4/1 =4

check the other values to make sure they are the same

8/2 = 4   12/3 =4   and 16/4 =4  

the constant of variation is 4

2.   y/x = k

3/1 =3

check the other values to make sure they are the same

6/2 = 3   9/3 =3   and 12/4 =3  

the constant of variation is 3